Find the live RTP version in the rules
Three to seven SCATTER symbols anywhere on the grid start the bonus round, but how often they land is not known in advance. The result of one session is random whatever the RTP. The RTP is an average taken over a very large number of spins, so it says nothing firm about the next session. Each spin is a separate draw.
Three RTP versions of Sugar Rush 1000 exist, but the one running on Live Casino is shown only in the game rules. This page lists the options, not the setting that is live. Read the game rules to see which version applies before you play.
x25,000 the bet is the ceiling of Sugar Rush 1000, and it is reached very rarely. It is a cap on the payout, not a target for any session. Whether a session comes near it cannot be known in advance, and no spin or bonus round signals it beforehand.