I just finished doing the covid extension for 60 days at MTT. Counter J was not too busy and the process was smooth.
My current extension would end at 11 april, the immigration police at the counter said that the covid extensions would be extended and he told me I could come back and do it later, I dont know if this has been confirmed elsewhere.
Remember to copy your passport, TM-6 and stamps, the copy service was quite crowded today.
TLDR : Answer Summary
A user shared their experience of obtaining a 60-day COVID extension at MTT, mentioning that the staff indicated potential for future extensions. They advised to bring copies of necessary documents due to crowded copy services.