On the node’s dashboard.
Or, if you still have databases, with an Earnings calculator (Update 2022-01-13: v11.0.0 - Detailed earnings info and health status of your node, including vetting progress)
If you deleted your identity, then you cannot check its earnings. We can’t say you even via support request, because it will be difficult to prove that you are the owner of the node. However, you can do that if you can sign a message with a private key of your wallet.