You can do it now but as I was told when I was out there Wednesday getting my covid extension that it will start from the day you apply. It will not be carried on from your existing Visa
Just a heads up if anyone is getting a covid extension make sure you bring a tm.30 form. I am at the immigration at the moment and a lot of people were turned away because they did not have a TM.30 form.
I spoke to two immigration officials and they both told me to wait because if I apply for the covid Visa extension today that it will start today. Anyway at least I have solid information now and it's better I wait until my visa is almost expired
I'm at CW now. Looks like I'm going to be here until after there lunch break. I'm starting to think I might leave it off until another time and the staff look very pissed off today aswell lol