Once filed you cannot stop a return the IRS already has.
Millions are still held up in processing for those things no matter which program that was used so all you can do is wait. Sadly there is no way to track it or speed it up.
And FYI ... the notice TT sent out did not say you needed to amend ... it said you "MAY" need to amend if the unemployment exclusion made you eligible for a credit not already listed on the original return and that the IRS was going to make the exclusion corrections themselves. Rule #1 of amending says you should not amend anything while the IRS is still processing your original return. When you start the amendment process the first thing they ask is if you already got the original refund and if you say no it says to wait.
