How often will the bonus round land?
Each spin lands new symbols on the five reels, so nobody can say when the Hold & Spin round or the Free Spins will arrive. How often the bonus round comes is not known in advance, and the result of one session is random whatever the RTP. A dry run can end on the next spin, and a lucky one can stop cold.
The five reels follow the RTP version the game runs. Only the game rules show which version Oz Casino runs, so check them before you start. The RTP tells you what share of a stake returns over a very large number of spins, and it says nothing about the next session.
On the five reels, a big hit can come through the Free Spins or the Hold & Spin round, but the maximum win is a ceiling reached very rarely. Reaching it depends on luck in a single session, and no one can plan for it.