Eth2 staking question – Coinbase user

I'm staking some ETH as ETH2 on Coinbase and am a bit confused about the rewards. It shows one amount as my 4.5% APR Lifetime Rewards, but when I click on that, a new window pops up that displays "Rewards Earned" and this is a much larger amount that is updated every second. What should I actually expect to receive when eth 2.0 launches?