Pub Kings outcomes stay open until reels halt
Reels land in a new arrangement on every spin, and no one can tell in advance when three SCATTERs will show on reels 1, 3 and 5. How often the bonus round comes is not known before you play. Whatever the RTP, the result of one session is random.
Each spin on the reels pays out according to one RTP version, and the game rules are the only place that shows which version a session runs on. Figures for both versions sit in the table, but the rules are where you confirm which one is live before you spin.
Top wins on the reels stop at a fixed multiple of the bet, so the largest payout you can reach grows with the stake. The ceiling is reached very rarely. Read the top prize as a limit on the payout, never as a result you can expect.