What is the process for extending a 60-day tourist visa in Thailand amid Covid-19?

A user shared their experience applying for a 60-day extension at Chaengwattana (Counter J) due to Covid-19. They noted that it was a smooth process but emphasized the need to bring a printed return flight itinerary back to the USA. The officials appeared to scrutinize the applicant's address more closely than in previous visits and even printed out a TM30 form. Despite the return flight being scheduled before the granted extension, the user was still approved for the full 60 days.