In previous tax seasons, Form 1040X has been released around the middle of March.
The following TurboTax help article shows the current availability for Form 1040X as 'available':
IRS forms availability table for TurboTax individual (personal) tax products
However, the specific instructions for amending 2021 returns have not been updated. When you go back into your return, look for the option to 'amend' your return and TurboTax should walk you through the process.
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