When mining via a mining pool, you will only see your funds in your MyMonero wallet after you withdraw your earnings from the pool, or after they do a pay out to your wallet.

It doesn't automatically stream into your wallet.

You will need to contact your mining pool and request a payout.
Make sure to provide them with your correct MyMonero wallet address.

But also please note that all mining pools have a minimum payout amount and you will need to check on their site what their payment threshold is.