I sent my 2020 return by mail. Now IRS says they have not received it. I need to print from Turbo tax top print a copy. How to get it

To access your current or prior year tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the section Your tax returns & documents.  Click on the Year and Click on Download/print return (PDF)

A 2020 tax return can only be printed and mailed, it cannot be e-filed.

Print, sign, date and mail the tax return to the IRS.  Include with the mailed return any forms W-2 and 1099 which have taxes withheld.  

There are no penalties for filing a tax return after the due date if filing for a tax refund or there are no taxes owed.

You should also get some sort of tracking to make sure that your return arrives safely.