We've recently added —node.coinbase-lockup flag that enables miners to delay their rewards for additional rewards. You can set a value between 0 and 3, where a larger number increases the lockup duration and reward rate.

Check the table in the screenshot for more info.

The default lockup is 0. However, even when set at 0, the rewards still have a short lock due to finality guarantees.

For longer lockup periods, rewards will not be immediately available.That means you will not be able to see them in Pelagus until the lockup period ends. You can read more about this feature and additional flags here in the docs.