His commentary on Genesis 1:1 is a long one. I just found it several paragraphs before the end. He says, "And behold, in this creation, which was like a tiny, miniscule dot of nothingness, all the creations in heaven and earth were created." Lest you think he meant that that dot was like the world we now see, only smaller, in the next paragraph he says there was no matter in it, and He then gave it form.
What an apt description of the early universe, which we today know was a miniscule dot of pure energy.
I am translating from the Hebrew, which I speak fluently. The open-minded skeptic is invited to go to any Jewish bookstore in an English-speaking country and verify that I am translating it correctly.
I have so far not located his citation of the Talmud. That does not, of course, detract from my point, as Nachmanides predated modern science by 700 years.