Information about the total amount of NiR in PoS is now available in the block explorerhttps://explorer.nirmata-network.comThis allows you to calculate the PoS daily rewards depends your staking amount:
Your staking amount * 1440 (average PoS blocks per day)
/ Total NiR amount in PoS = Your daily rewards (in blocks)
For example, if you have 1000 NiR in staking
1000 * 1440 / 57232 = ~25 blocks you get per day as PoS rewards (each block 1.618 NiR)