Known rules, unknown rounds
Decide your session budget knowing that the bonus round comes at random, and no one can say how often it will land. The timing is not known in advance. The result of one session is random whatever the RTP, because the RTP is an average over a very large number of spins, not a promise for your next hour of play.
Open the game rules before you stake to see which RTP version runs here. That detail is shown only in the game rules, so check there before you rely on any percentage printed elsewhere. Each version returns a different share of stakes over time, and the rules are the only place to confirm which one applies.
Decide whether a top prize matters to you before you raise the stake. The maximum win is 50,000 times the bet, a ceiling that is reached very rarely. Treat it as the upper limit of the game, not as an outcome you should plan around.