1. Date the check for the day you write it.
If it is included with your tax return and the postmark is on or before the due date, the check is considered received on the postmark date. No interest for the days it takes to get to the IRS.
2. You can pay online. TurboTax does not know if you mail a check or pay online, so it does not matter.
If you are paying your tax liability for tax year 2023, be sure you indicate that on the state website you used to pay the tax. Paying your tax liability (the tax payment due on your return) is NOT the same as paying Estimated Tax Payments.
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