How often will the bonus round land?
Two Scatters on the reels may trigger a respin or a hook animation, and the chance of a third Scatter after that is random. The bonus round therefore comes at no fixed point in a session, and no spin count tells you when it will land. The RTP describes the long run, so one session can end well above or well below the stake.
Every spin on the reels runs on one RTP version, and the game rules are the only place that names it. Other versions in this series differ in RTP and maximum win, so the version in the rules is the one that counts.
Spins on the reels rarely reach the ceiling. The maximum win is the upper edge of what the game can pay, and it is reached very rarely, so do not expect it from a session or a bet.