Set expectations while the reels still turn
Deciding to start a Mustang Gold session means accepting that how often the bonus round comes is not known in advance. The result of one session is random, whatever the RTP of 96.53 says. A long run may drift toward that figure, while a short run can end well below it or well above it.
Checking which RTP version this game runs is possible only through the game rules. Open the rules screen before you stake real money, and compare the figure it shows with the 96.53 listed on this page.
Planning a session around the top prize means working from a ceiling, not a forecast. The maximum win is x12,000 of your bet, and it is reached very rarely. Treat it as the upper edge of what the game can pay, not as a likely result.