After you file

Did you file 2019 and 2020 tax returns?  Are you a dependent, or perhaps not otherwise eligible?

 

The IRS is sending out Stimulus #3 payments in batches, and will take a few weeks to complete them all.   Per the IRS:

Payment Status Not Available: We haven't yet processed your payment or you're not eligible for a payment.

 

Also see this:

Have a stimulus check problem? Better not call the IRS. Do these things instead (cnet.com)