At most books, BYU is currently a 10 point favorite at -110 odds, which implies a 52.4% chance BYU wins by at least ten. The books want the line to be in a spot where there’s money coming in on both sides. If more money starts going for one side then the line will move.
There is also what’s called the moneyline, which is where you bet on a team to win by any margin instead of the spread. BYU’s moneyline is currently -360, which implies a 78.3% chance BYU wins the game by any margin.