Assuming all our opponents are undefeated when we play them (Best case scenario):

When we beat Nebraska, we MAY crack the top-25. Likely range: No. 23-no. 27 - Nebraska moves to "Also receiving votes"

When we beat Boise St., we crack the top-25 for sure. Likely range: No. 21-25 - Boise moves to "Also receiving votes"

When we beat UCLA, we move up 5-7 spots. Likely range: No. 15-20 - UCLA drops at least 8 spots, hopefully behind us.

When we beat Michigan, we move 2-3 spots. Likely range: No. 12-18 - Michigan drops at least 6 spots, hopefully behind us.

So, when BYU finishes September with a 4-0 record, we would definitely be inside the Top-20, with a chance of top-10 striking distance - depending on how the other preseason top-25 perform.

And, hopefully BYU is ranked ahead of the four teams that we beat - but no guarantees. (Nebraska could have a road win over Miami, Michigan would have wins over Utah and Oregon St., UCLA could have wins over Virginia and Arizona, and Boise could have wins over Washington and Virginia).