Before the first spin starts
Decide before the first spin that the bonus round may never come. How often Free Spins start is not known in advance. Each spin is independent, so a long run without the feature says nothing about the next spin. The result of one session is random, whatever the RTP version.
Open the game rules before you start to confirm which RTP version runs on this site. That version is shown only in the game rules. The four versions sit within a few hundredths of a percentage point of each other, so which version runs changes the expected return very little.
Plan each session around its stake, not the top prize. The maximum win is x25,000 of the bet, which is A$25,000 at an A$1 bet, and it is a ceiling reached very rarely. Any session ending near that figure is an exception, not a result to expect.