can i buy extended warranty on my MacBook pro 2020

I am not aware of that. Ask at the Apple online store (US information below):

Apple Online Store

Apple.com is a convenient place to purchase Apple products and accessories from Apple and other manufacturers. You can buy online or call (800) MY–APPLE (800–692–7753).

Outside the US:

https://www.apple.com/contact/

.

Only if you purchase within 60 days of initial receipt.

I thought we had 90 days due to COVID-19