Big Bass Splash keeps its odds hidden
The bonus round arrives at random on the reels, so how often it comes cannot be known in advance. The result of one session is random too, whatever the RTP. The RTP describes the long run across a very large number of rounds, not the outcome of the next hour.
Each spin on the reels runs at the RTP version the lobby carries, and that version is shown only in the game rules. Two versions of this game can pay back differently over the long run, so the rules are the place to check.
A spin on the reels reaches the largest possible win only very rarely, and that ceiling is a fixed multiple of the bet. Hitting it is not something any session can plan for. A big win on one spin says nothing about the next, and the ceiling is not a target to aim for.