Your reward is based on several factors like the amount of users on a project, GRC per Magnitude reward, amount of whitelisted projects and your share of the total work. While pending rewards is recorded on chain once per day, the result can vary slightly until you finally stake your block.
Staking requires an open, unlocked for staking, wallet.
User has BOINC projects possible for rewards, but no magnitude is recorded on network. There are possible rewards on Gridcoin.