Expect bonus timing to stay unknown
The 96.50 RTP is a long-run average across many rounds, not a result for one session. How often the free spins arrive is not known before you play, and nothing on this page can tell you when the next Free Spins round will start. Each spin of Lava Balls is random, so two players with the same bet can finish far apart whatever the RTP says.
96.50 percent is the RTP version listed for Lava Balls, and the game rules are where the version running in the 77 Casino lobby is shown. Read that section before you bet, since it sets the figure you play against. The RTP is the long-run return on A$100 staked, so a single session can land above or below it.
x4,800 the bet is the highest multiple Lava Balls can pay, and that ceiling is reached very rarely. The maximum win is a limit on what the game can pay, not a result any player should plan around. Its size says nothing about how often a session gets near it.