You can use either turbotax's tax caster (still for 2019 but not much has changed) or the IRS withholding calculator to get an idea of where you are.
https://turbotax.intuit.com/tax-tools/calculators/taxcaster/
https://www.irs.gov/individuals/tax-withholding-estimator
If you wanted to fork over $65 for the 2019 version of Turbotax, you could put in your 2020 numbers -- not much has changed in the tax law so the result will be very close. But I would use the two estimators first.
