When generating your Login Reward UI, you can use a combination of the Player Login State's information as well the following blueprint nodes to easily determine whether or not a reward is available.

Which reward in the list of rewards is available can easily be determined by the total rewards claimed for that respective category and the following blueprint nodes for whether or not the next reward is available to be claimed.

The below pure blueprint nodes are quite self explanatory, they are simply convenience blueprint nodes to quickly determine reward availability from the Player Login State data.