Third quarter estimated tax payments for tax year 2020 are due on September 15, 2020. Fourth quarter estimated taxes on due on or before January 15, 2021.
The TurboTax desktop CD/Download software for tax year 2020 should be available in November 2020. The TurboTax online editions for tax year 2020 should be available in December 2020.
You can use the worksheets in the IRS Form 1040-ES for the 2020 estimated taxes - https://www.irs.gov/pub/irs-pdf/f1040es.pdf
Also, see this TurboTax support FAQ for the 2020 estimated taxes - https://ttlc.intuit.com/community/tax-payments/help/can-turbotax-calculate-next-year-s-federal-estim...
