Only so much can change in the first three weeks of a college football season. Most top teams will play one decent opponent at most in that span. Most of the stuff we will end up remembering from this season hasn't happened yet.
Of 133 FBS teams in 2023, two-thirds of them (89 in all) have a current projected win total (per SP+) within one win of where it was in the preseason. The top three teams in the preseason AP poll (Georgia, Michigan and Ohio State) have outscored their first nine opponents by a combined score of 334-60.