Can anyone predict the top payout?
Deciding to wait for the bonus round means betting on something no one can time. How often the bonus comes is not known in advance, and this page does not estimate it. The result of one session is random whatever the RTP, so a run can finish well above or well below the stake. Keep each session within a budget set before you start.
Comparing returns before you bet starts in the game rules, because the RTP version running on this site is shown only there. The Gates of Olympus series has several versions with different returns, so read the version label before you set your stake.
Aiming for the top payout means accepting a ceiling that is reached very rarely. The maximum win of Gates of Olympus POP is set as a multiple of the bet, and it is a limit on the payout, not a target a session will hit. Size the bet to the budget, not to the top payout.