Yes, you can pay your taxes owed to the IRS by mail using Form 1040-V. To avoid a penalty the payment must be postmarked no later than July 15, 2020.  You can use TurboTax to prepare and print Form 1040-V.

[Edited 04/06/2020 | 3:00 pm PDT]

If you are referring to paying your TurboTax fees, unfortunately the fees must be paid before you can e-file or print your returns.  They cannot be paid by mail.

One option is if you quality you can use TurboTax Freedom Edition, 

https://freefile.intuit.com/

To qualify,  is your adjusted gross income (AGI) $36,000 or less?

Were you active duty military in 2019 with an AGI of $69,000 or less?

Do you qualify for the Earned Income Tax Credit (EIC)?

How do I switch to IRS Free File Program delivered by TurboTax?

https://ttlc.intuit.com/community/downgrading/help/how-do-i-switch-to-turbotax-free-file-program/00/26264

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Or you can try TurboTax Free Edition

https://turbotax.intuit.com/personal-taxes/online/free-edition.jsp