"God" probably doesn't experience "time" they way we do. I can't prove that, of course. But I assume our notion of being is so limited and linear compared to a being we want to think of as "God."
Perhaps "His," "Her," or "Its" desire to see the God-Self reflected back at HIm, Her, It occurred simultaneously with His, Her, Its "creation" of the universe. I know this is not making much sense, but it is extremely hard to speak simply, plain, or even coherently about "God," because, well.... the subject of our inquiry is "God."
But I don't think "God" was existing in his space saying to himself (I just use 'him' or 'himself' strictly as a matter of grammatical convenience) saying 'Gee, I am lonely. I shall create matter out of all of this nothingness; and I shall create living, breathing, self-reproducing beings of all kinds. I shall create landscapes of all kinds. I shall separate dark from light and I shall create 'sentient' beings who are the most capable of enjoying this and they shall call out to ME, and I shall give them my LOVE!'
I don't suppose that it took a linear movement of "time" between "God" making that determination and beginning the creation process. What I'm saying is (and I might be wrong; certainly I am more wrong than right) I don't imagine there was, for "God" a "before," "during," and "after" as there is with you and me, Jangaplanet.
I think we have to posit something like that if we are to believe that "God" is "All-Knowing." If "God" is "All-Knowing" then 'He' possess all knowledge eternally. That is, "He" does not need to acquire it in some kind of step-by-step process -- this would be linear thinking and it would be to bound "God" to "time."
If "God" is "All-Knowing," then, it seems to me that if "He" took the decision to create the universe, that decision had been eternal and timeless.
But I could be completely wrong. Thanks for the challenging and original question.
Take it easy.