Hidden before the spin, still random after it
Each spin on the 5x3 grid is random, and how often the bonus round comes is not known in advance. It may arrive early in a session or not at all. The RTP describes the return over a large number of spins, not the result of your next session. A session can finish above or below the stake whatever the RTP says, and that holds for every bet size.
On the reels, the return you get over time depends on which RTP version runs in this lobby. That version is shown only in the game rules, so check them before you play. Two versions of the same slot can pay back differently over time, and the rules are the only place to confirm which one is live.
The reels can line up for a large win, but the maximum win of Wolf Gold is a ceiling that is reached very rarely. No number of spins brings it closer on a schedule. Read the maximum win as the upper limit of the prize, not as a figure to expect from a session.