The 2020 amended form return is not yet available as you noted and will be available for the e-file option. You can keep track of the status by checking back on this TurboTax help article: https://ttlc.intuit.com/community/forms/help/irs-forms-availability-table-for-turbotax-individual-pe...
TurboTax no longer supports e-filing for any 2019 returns (although the IRS does accept e-filing for prior years). This is a TurboTax limitation, not an IRS limitation.
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