Sitting down for a first spin nobody can predict
You choose the bet, press spin and accept that every outcome comes from chance. How often the bonus round arrives is not known in advance. Nobody can predict when it starts, and the result of one session is random whatever the RTP. An RTP figure describes the average over a very long run, not what happens during the session in front of you.
You decide which game to open, and the RTP version a game runs is shown only in its game rules. Reading those rules before you stake money keeps the figure you rely on tied to the game you actually play.
You weigh the top figure, x5,000 times your bet, against your own budget, because the maximum win of Big Bass Bonanza 3 Reeler is a ceiling that is reached very rarely. Plan each session around the stake you can afford to lose, not around that ceiling.