singbet

Can you bet after the river card is dealt? Poker allows betting on every street. Players can bet before the flop, after the flop, after the turn, and then again after the river. A player can check, bet, call, raise, or reraise after seeing the river.

Whoever made the last bet or raise on the river that got called is the one who shows first, then action proceeds clockwise from that person around the table with players showing their cards in turn. By the way, there is no rule against showing your cards early.