It should be on it's way. If you do not receive one, to see instructions how to do that, click here: Recover Rebate Credit update
The Recovery Rebate Credit is a credit that was authorized by the CARES Act. If you were eligible for an Economic Impact payment, commonly referred to as a stimulus payment, but did not receive one or you received less than the full amount as an advanced payment in 2020 then you can claim the Recovery Rebate Credit on your 2020 tax return. To learn more, click here: Recovery Rebate Credit