I think you are correct. It is amazing that Moses knew these things when writing Genesis.....but I think he had help.
Gen.1:1- Perhaps billions of years ago!
Gen.1:2-"Became" chaotic, confused, dark and formless because of Lucifer's rebellion. The Hebrew word translated in most Bibles here as "Was" is better translated "Became". The same word is properly translated in Gen. 19:26. Lot's wife "BECAME" a pillar of salt. When you translate Gen.1:2 properly it allows for billions of years of soup, fish, monkeys, birds, dinosaurs or whatever.
Gen.1:3-Beginning of a new creation...the first 24 hour day. Light begins to penetrate the thick cloud cover.
Gen.1:6-The second 24 hour day. Clouds rise creating an expanse between the waters of the seas and the waters of the clouds(under and above). Ocean recedes and dry land appears.
Gen.1:11-Grass and herbs planted on the third 24 hour day.
Gen.1:14-Fourth 24 hour day sees the Sun become visible through the thinning clouds and toward evening the moon and the stars appear.
Gen.1:20-Fifth 24 hour day sees birds and sea life created.
Gen.1:24-Land animals and man created on the sixth 24 hour day.
Gen.2:2-Seventh 24 hour day(Sabbath)is blessed and made holy.
In six days God brought the Earth back to a state of order and then rested from his labor. God is not a God of disorder or confusion. 1st Corinthians 14:33