It is too late to request an extension. You had to do that no later than April 15, 2025. So now your 2024 return is just late. File as soon as you can. If you are getting a refund there is no penalty for filing after the deadline. If you owe tax due, you are subject to late filing penalties and interest.
A 2024 return can be e-filed until October 15,2025. After that you will have to file it by mail.