I filed my taxes for 2020 here. I need a copy of them today. How can I get a copy?

See the instructions at the following link.

How do I access a prior-year return?

you need to be in the account used to prepare  2020. all fees must be paid but then you can print it out. if you don't have a printer you will need to download a PDF of the return to a portable drive. it can be taken to a UPS, FEDEX and other locations where you can print out the pdf. call to check. 

https://ttlc.intuit.com/turbotax-support/en-us/help-article/security-risk/account-recovery-request-turbotax-account/L3GhqZLVE_US_en_US?uid=l58efsvw 

How to Access prior year online returns
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/27010

If you can't get the side menus to open up to access the prior year..... You need to start entering some basic Personal Info in 2021 for the side menu to open up. Just continue a little ways into 2021.

If you used the Desktop CD/Download program then the only copy is on your computer and not saved or stored online. So you need to make and keep your own backups.

Or request a transcript from the IRS
https://www.irs.gov/individuals/get-transcript