Every time I close a tax form Turbotax quits responding and must force quite the application.
I've experienced this with 3 different tax files (xxx.tax2020)
Turbotax Home & Business version 2020.r16.037
Mac OS Catalina 10.15.7
Mark
It looks like you have all the minimum mac requirements. I would suggest trying a update or Remove and reinstall TurboTax for Mac.
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I have found that if I just walk away from it while saving or quiting for about 10-15 minutes it will eventually complete. If something is going to take that long it should have a progress bar so you don't think it's out to lunch. Even the Mac process view says that it is not responding.