Unemployment IRS and a missing W2. Amend ?

Hello everybody, I have a question. I filed my taxes, got my return and everything is fine. But I forgot to add a W2 of about 800$ and I also received unemployment in 2020. How should I procced from here? Wait until IRS gives back the Unemployment difference back to me, and then if they didn't catch the missing W2, amend with the missing W2 ? 

Thank you!