"The current supply increases by ~4%/monthly, meaning that
95% of supply will be reached in late 2020, At this point, the
releases of X-CASH 2.0 will already have been enabled with
the PoS algorithm, and the inflation rate will switch to 0,1-0,5%
constant rate."

Payouts are based on your contribution to the work of your pool. Different pools have different payout levels. Look for your pool's payout level, which may be between 1000 and 10,000 XCA.

When you reach that point, you'll see the payment made to your wallet. If your wallet is open on your desktop at all times, you'll see the funds reach your wallet. If not, you will need to open your wallet and let the wallet sync up with the latest data from the blockchain.

There really is no issue with the wallet, you're just keeping updated with the blockchain in the app directly. When you have the chain updated to the newest block, you update the wallet, like any other.

I think it's against the terms of agreement to share that information until the infrastructure is in place. This should be part of a non-disclosure term in a contract with a reputable exchange.