1040-x

I had e-filed my return with an error and IRS has accepted it on 5/9/21. However, I still didn't get my refund. Today I realized that I claimed a credit for which I am not eligible ( EV lease, fed tax credit only for purchase, I thought I answered Turbotax interview questions correctly) and I need file an amended return. When is the right time to file 1040-x? Should I file immediately or wait for IRS to either give my refund or ask a question? Even the help from Turbotax on this topic is not very clear.  

Any help will be appreciated greatly.  Thanks in advance.

NV