2Miners pool uses fair reward system "Pay Per Last N Shares" - PPLNS. This system is used to prevent "pool hopping". Pool checks how many shares you've sent from the last N shares of the pool and makes the payouts based on that value. N value is different for different pools:
Grin - last 60 000 shares
Ethereum, Callisto, Beam, Nervos CKB - last 50 000 shares
Zcash, Zencash, Zelcash, BitcoinZ, Bitcoin Gold, Zclassic, Monero, Zcoin, Aeternity, Ravencoin - last 20 000 shares
Ethereum Classic, Expanse, Metaverse ETP, Pirl - last 12 000 shares
Share rate of the miner is shown on the statistics page as well as the approximate reward of the miner if pool finds block right now. This reward is just an estimated value. The found block could include some transactions and cost more. On the other hand the block could be Uncle or Orphan.
2Miners mining pools: https://2miners.com/
2CryptoCalc mining profit calculator: https://2cryptocalc.com/