Genesis 2:1

And the creatures of the heavens and earth, and all the hosts of them, were completed.

This belongs to the [passive] verb form in which the subject is not mentioned, as in "all the mountains were covered." The meaning here is "they were completed." The ocean is included in "the land" specified in this verse, as they are one unit.

AND ALL THE HOST OF THEM. “The host of the earth” are those which have been mentioned: beasts, creeping things, fish, and all growing things, and also man. “The host of the heavens” are the two luminaries and the stars, mentioned above, just as it is written: And lest thou lift up thine eyes unto heaven, and when thou seest the sun and the moon and the stars, even all the host of heaven. It also includes the Separate Intelligences, just as it is written: I saw the Eternal sitting on His throne, and all the host of heaven standing by Him; also, The Eternal will punish the host of the high heaven on high. It is here [in the expression, all the host of them], that He has hinted at the formation of the angels in the work of creation. Similarly, the souls of men are included in the host of heaven.

ויכלו, when all the phenomena intended to comprise the physical universe had materialised

ויכלו השמים והארץ וכל צבאם, this verse refers to both the hosts of heaven and the hosts of earth, including their respective derivatives, תולדותם. They had all been completed on the sixth “day,” and henceforth there would not be any new phenomena in the universe, unless created by a special act of miracle. The fact is, that already during the first six “days” when the laws of nature were formulated by the Creator, He inserted escape clauses into this system of natural law that would allow Him, if and when required, to temporarily suspend such laws at His discretion.
This is explained in Bereshit Rabbah 5,5 where Rabbi Yochanan (or Yonathan) is quoted as saying that G’d entered into an agreement with the oceans that when the time would come they would respond to Moses’ command to be split, etc., in order for the Israelites at that time to cross on dry land. This is the meaning of the words in Exodus 14,26 וישב הים לפנות בוקר לאיתנו, “the sea returned towards morning to its original format.” This is a reference to the condition which G’d had imposed on the sea at the time He set certain rules for it to follow. Rabbi Yirmiyah ben Eliezer added that G’d had not only made such arrangements with the oceans, but also with all other phenomena which He had created during those six “days;” this is reflected by Isaiah 45,12אני, ידי נטו שמים וכל צבאם צויתי, “My own hands stretched out the heavens and I marshaled their host.” The extra word צויתי, refers to this clause. We also have Joshua 10,13 in which Joshua is described as arresting the sun and the moon in their respective orbits. Had it not been for the provision by G’d at the time of the creation of these planets, Joshua could not have successfully ordered them to perform what would have been an act of disobedience against the rules set for them by G’d. The same holds true for G’d’s dispatching the ravens to feed meat to the prophet Elijah (Kings I 17,4-6), or His ordering the fire not to burn Chananyah, Mishael and Azaryah. (Daniel 3,23) G’d had also ordered the lions not to harm Daniel (Daniel 6,26). Similarly, G’d had commanded the whale to swallow Jonah, keep him alive, etc. (Jonah 2,11)

ויכלו, “they had been completed;” whence does the practice to recite this paragraph during kiddush while standing originate? It is because this paragraph is a testimony, and testimony must always be given while the witness is standing. (Compare Maimonides laws about testimony, chapter 9, halachah 7 stating that minors are not acceptable as witnesses as it is required that two men, i.e. adults, stand when testifying,” i.e. ועמדו שני האנשים, “the two adult witnesses shall be standing, etc.”) (Deut 19,17). We are taught further in the Talmud tractate Shabbat folio 119, that when a Jew returns home from the synagogue on Friday night, and he recites this paragraph, two angels will place their hands upon his head and bless him, saying: “may all your sins be removed from you, and may you enjoy complete atonement.” If you were to ask where we can find this line in scripture? We refer you to Leviticus 5,8, where testimony is discussed, and the Torah condemns someone who knows of something that he is required to testify to, but refuses to give such testimony. It says there that by failing to give his testimony, he will have to bear his sin. It follows that testifying truthfully results in one’s sins being removed. Giving testimony that the Lord has created the universe in six days concluding on Friday night, by reciting this paragraph while standing, is such testimony.