After you file

It is unusual. It should not be in connection with your their stimulus payment though, 

To find out where your refund is, first check your e-file status. 

Please make sure the IRS received your return. You might need to call the IRS customer support number at 1-800-829-0922 -or- 800-829-1040.

You can check the status of your third payment by using the Get My Payment tool.