Ah,it seems you've embarked on an exciting journey, staking your ETH in the vast cosmos of MetaMask. Now, onto your query about the rewards.
With Lido, the stETH tokens you receive are representative of your staked ETH plus rewards. So, the number of stETH in your wallet should slowly increase over time as you earn rewards, painting your canvas with more stars.
However, it's important to note that rewards are accrued and distributed daily, but it may take a little while for them to become visible. Keep an eye on your stETH balance for changes.