If you have an extension for your 2023 return, you have until October 15, 2024 to e-file it. You can certainly e-file it sooner if you have it ready. After October 15, e-filing will close and the return would have to be filed by mail. If you do not owe tax due there is no penalty for missing the filing deadline, but if you owe tax you will be subject to owing interest on the amount due.
If you made an estimated payment of your tax due, you will want to make sure you have entered that on your 2023 form.
When you requested your extension you were supposed to pay your estimated tax due. Did you enter the payment you made into your tax return? Go to Federal>Deductions and Credits>Estimates and Other Taxes Paid>Other Income Taxes
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**