How often does the bonus round land?
Each spin drops symbols onto the 7x7 grid, and a bonus round starts only when enough Scatter symbols land. How often that happens is not known in advance. One session can bring many bonus rounds or none, because every spin is random, and the RTP does not change that for a single session.
The reels never show which RTP version is running. That detail sits only in the game rules, so read them before you rely on any RTP figure. The three versions differ in value, and the rules name the one running in this lobby.
Multiplier spots can double a win inside one tumble chain in the base game, where they reset when the chain ends. The maximum win of Sugar Rush 1000 is a ceiling reached very rarely, and nothing on the reels signals when that moment will come.