Read the game rules for the version in use
You decide how long to play and what to stake per line, but nobody can tell you when the bonus round will come. How often Free Spins or the Jackpot Reveal Bonus Game appear is not known in advance. The result of one session is random, whatever the RTP of 96.53 says about the long run. Two sessions on the same bet can end far apart.
You want to know which RTP version applies before you place a bet, and the answer sits in one place only: the game rules. Open the rules inside Mustang Gold to see which version is running. Read them before your first spin, so the figures you compare match the game you are playing.
You may plan around the biggest prize, but the maximum win of Mustang Gold is a ceiling reached very rarely. It limits what the game can pay. It does not forecast what your session will bring. Set your budget before the first spin and keep to it.