You can use the Rewards page to check how much you have earned every cycle; both for LiSTX and LiALEX.
They must be opened separately:
LiSTX: https://app.lisalab.io/li/stx/rewards
LiALEX: https://app.lisalab.io/li/alex/rewards
Important to note that, if you are holding the wrapped version, the reward will not reflect on this page. You would need to manually input the amount in the Unwrap page to check the latest balance of STX or ALEX.