I got a non o retirement visa from Thai embassy in London in September. It’s very straightforward and quick as long as you meet the requirements. You need to have health insurance to cover you for the duration of the initial 90 days in Thailand. You need to open a Thai bank account quickly to season the 800k baht for 2 months before you get the yearly extension (so you actually don’t have 90 days to open a bank account).
You have an extension of stay due to unable to travel or a 60 day covid extension. The last day for getting a covid extension is November 26th but it seems that some immigration offices are now demanding proof that you are actually going to leave Thailand. Suggest you buy a ticket out and apply for covid extension again. Note it’s at the discretion of the immigration officer whether he grants you an extension or not.
If you’re filling in COE (and embassy is accepting it ) you’ll need to fill in as per current rules ie 100k covid and 7 nights hotel. Option is to wait until thai pass is available or come in on COE and then get refund based on the new rules