My South Carolina return is still showing pending. I understand that the IRS will not accept returns until 2/14/21 but I can't find out when SC will accept return

The South Carolina Department of Revenue (SCDOR) will begin accepting Individual Income Tax returns for tax year 2020 on February 12, 2021, consistent with the date announced by the IRS.

If you qualified for the Recovery Rebate Credit, it is reported on line 30 of your 2020 Federal tax return.

Since the IRS has not opened yet, we would like to give you the opportunity to review and update the Recovery Rebate Credit portion of your 2020 tax return before they open on February 12th.

If you want to review and update your 2020 return, please enter your information here by February 6, to have your 2020 tax return sent back to you.  You will then receive an email from TurboTax on February 8, letting you know that your return is available and providing you with detailed instructions on how to review, update and re-file your tax return without the Recovery Rebate Credit.

If you do not want to review and update your 2020 return, then you're all set.  No further action is required. We will securely hold your tax return and send it to the IRS when they begin accepting e-filed returns.

See also this TurboTax Help.