Known RTP before, unknown result after
The 96.50 RTP is an average over many rounds, so it does not predict one session. How often the free spins come is not known in advance, because 4 Scatter symbols can land on any spin. Whatever the RTP, the result of one session is random and can end well above or well below the average.
96.50 is the only RTP version listed for Gates of Olympus on this page. Which version runs for you is shown only in the game rules, so open that section before your first spin and read which version is named there.
The x5,000 ceiling equals A$625,000 at the highest bet of A$125. Players reach the maximum win very rarely, and no session can be planned around it. The volatility is high, so results can swing sharply from one session to the next.