Know the RTP version in the rules
You choose how much to stake per spin, but you cannot decide when the bonus comes. How often Black Bull triggers its free spins is not known in advance, and it is random. The result of one session is random too, whatever the RTP version in play. Two players with the same bet and the same number of spins can finish with very different totals.
You check the game rules before the first spin, because only there is the RTP version shown. The table above lists both versions, but the rules name the one in play on Pelican Casino. Check that line before you decide how much to deposit, because the two versions return slightly different shares of stakes.
You decide how far to chase the top prize only after reading it as a ceiling. The cap is set as a multiple of the bet, and a round ends the moment that cap is reached. Hitting it is very rare, and nobody can say when or whether a session will get close to it.