Would like to check my estimated taxes for next year 2020 but I already submitted my taxes for this year. How can I check on turbo tax?

Open up your account and your tax return that was filed and type estimated taxes for next year in the search box and click on jump to estimated taxes for next year in the drop down box. Click No for the question about updating your W-4 and continue on.

You could also use the TurboTax Taxcaster calculator to estimate 2020 taxes: https://turbotax.intuit.com/tax-tools/

note that you must make the payments TT does not.