Mustang Gold results stay random
Every spin lands symbols across the five reels, and three campfire Scatters on reels 2, 3 and 4 are what start the free spins. How often the bonus round comes is not known in advance. It depends on the spins themselves, not on a schedule. The RTP describes a return over a very large number of rounds, so the result of one session stays random whatever the RTP.
Each spin ends with symbols on the grid, but nothing on the grid shows which RTP version is running. Which RTP version this site runs is shown only in the game rules, so open them before the first spin. Read them once, then play with the numbers in front of you.
Money Symbols and free spins can pile up on one spin. The maximum win of Mustang Gold is a ceiling that very few sessions reach, and no one can say in advance whether a given spin gets near it. Treat it as the top of the paytable, not as a target.