Just so you're completely clear
@St***
, IF you have an "extension of stay" based on employment in your passport (which is NOT a visa) it stopped the day they cancelled your work permit.
To apply for a covid extension you need to talk termination paperwork from your employer to the immigration office where you got the extension, cancel it, THEN apply for the 60 day covid extension.
The reason I mention this IS; if you're on an extension and your work permit was cancelled months ago you're on overstay from that date. I would suggest you go to the immigration ofice with your termination paperwork and sort this out sooner rather than later :)