Limits of any single session
Three Scatters landing on reels 2, 3 and 4 start the Free Spins, yet no player can know in advance how often that happens. The result of one session is random whatever the RTP. Two sessions on identical settings can end in opposite places, so the RTP describes the long run, not the next spin.
Every spin stops the five reels on a new set of symbols, while the payout percentage behind those symbols depends on the RTP version in use. Which version runs here is shown only in the game rules, so open the rules screen before the first spin.
Multiplier Wilds raise the value of a winning line in Big Bucks Saloon, and the top of that scale is the maximum win. That ceiling is reached very rarely, so no session can be planned around it. Read it as the outer limit of the game, not as the usual result of a spin.