Understanding which parts of this slot stay random
Before you start, decide what you can afford to lose in a single session, because nobody can tell you when the bonus round will come. How often it comes is not known in advance. The result of one session is random, whatever the RTP, so a long run of dead spins and a quick bonus are both possible.
Check the game rules before you put money on a spin, because the RTP version Uwin Casino runs is shown only there. Figures quoted on other sites or in old reviews may describe a different version, so read the rules page and rely on that.
Treat the maximum win as a ceiling, not a target, when you choose your bet. Gates of Olympus caps a win at x5,000 your bet, and a win that size is reached very rarely. Ceiling values describe the most a single round can pay, not what a session will return.