There is a step-by-step menu in TurboTax Premier for preparing 2020 estimated tax vouchers. After you complete the Deductions & Credits section, you are taken to ''Other Tax Situations''. Scroll down to Other Tax Forms. Then select Start next to W-4 and estimated Taxes.
The first question in the interview is for updating your W-4, you can say No. The following screen will allow you to review your estimates for next year through the step-by-step interview mode.