Timing, session results and the ceiling
Choosing Gates of Olympus 1000 means accepting that nobody can say in advance how often the bonus round arrives. Each spin is random, so the outcome of one session is random too, whatever the RTP. Expect that uncertainty, and do not read a pattern into past spins.
Before you compare returns, find out which RTP version this game runs. That detail appears only in the game rules. Open them before you stake any money, then check the RTP table on this page to see what each version pays back.
Plan for the maximum win as a ceiling, not as an expectation. The top prize is x15,000 the bet, which is A$7,500 at A$0.50 and A$1,875,000 at the A$125 maximum bet. Reaching that ceiling is rare, and no figure on this page says how rare.