It’s been over 21 days since my return was accepted. Called IRS and they said they sent a CP53 notice on 02/20/20. Still haven’t received. Can something else be wrong?

It means you will receive a check from the IRS. Here's information about the CP53 notice you received. 

https://www.irs.gov/individuals/understanding-your-cp53-notice

How can I find out how much my refund check will be? It’s coming from the 10,200 unemployment tax break I’m thinking it could be 1,686 does anyone know because my letter says notice CP53 date of 9/13/2021

@Kalebsdad5152003 

We have no access to your return, so we do not know how much your refund for tax paid on unemployment will be.   Those checks are being issued by the IRS, and there is no way to track them.

https://www.irs.gov/individuals/understanding-your-cp53-notice