Sharon Pimlott, I believe I got my OX (Long Stay) visa and then was given time to open two Thailand bank account one was a fixed interest where I placed $800,000. the other an everyday account. I believe the $800,000 is a security deposit. You must get Thai health insurance for the duration of stay with annual coverage of at least 40,000 Thai Baht for outpatient treatment and at least 400,000 Thai Baht for inpatient treatment. Health insurance has to be with one of the approved companies from the Thai General Insurance Association.
If you want the current answers to your many questions it would be better to speak to someone who actually works for the Thai Embassy, instead of Thailand Visa Advice - And Everything Else. as this site will give good advice that has worked from other people's experiences. Many things have changed and may change by the time that you are ready to submit your application.
The only thing they asked him for at the airport was to download these two apps nothing to do with a certificate that you have done quarantine including all the tests.