That would be acceptable.
Payment options include:
See Deferral of employment tax deposits and payments through December 31, 2020, question and answer 29 How can an employer pay the deferred amount.
Next year in 2022, when completing your 2021 tax return, the payments will be entered in the Estimates and Other Income Taxes Paid section as Other Income Taxes Paid. As @NCperson pointed out, they are not technically estimates, but payment of deferred self-employment taxes and therefore part of the 2021 taxes due.
To get to this section in 2021, inside TurboTax, enter tax payments and select the Jump to link in the search results.
[Edited 04/03/2021 | 12:52 PM PST]
@chicago_6
