if you owe you can file whenever you like but penalties and interest are increasing every day.
if you are due a refund it must be filed withing 3 years of the due date.
Turbotax closes e-filing for 2023 on or about 10/15/2024. Then, if you have not paid your fees, you'll need to buy one of the desktop apps to finish your return - full pc or Mac required. Prior years can no longer be prepared online or e-filed.