First: there's no such thing as a covid visa, people just call it that's. Its a "60 day unable to travel due to Covid extension" and is avaliable for anyone on any visa. Your first extension will start from the day you apply for it and with limited circumstances there's no limit to them.
Second: as of now, the last day to apply for the extension is January 25th. The government hasn't extended it past then, however it could be. Historically they wait until the last couple days to announce the covid extension.