You may be able to see a processed payment of your stimulus checks via your IRS Account. Steps to Create your IRS Login account.
From inside your IRS account, navigate to Tax Records before clicking on the external GET TRANSCRIPT button. On the new window, select Other as a reason and enter a Customer File Number, if applicable, before pressing the GO button.
Under Account Transcript, select 2020. You will see all deposits and transactions between you and the IRS, including stimulus payments. At the bottom of the page will be a transaction history, including Economic Impact Payments, if applicable.