For your federal Extension.
If you are preparing your extension on time, it should be granted.
You can use TurboTax Easy Extension, and you'll get a confirmation from TurboTax within 48 hours.
This is also available in the TurboTax software.
For your state extension status
Many states will use the federal extension, and not require an additional extension to be filed.
Please reference your state on this List of Department of Revenue by state List of state DOR's
If your state requires that you file an extension separately, you'll have to contact the taxing authorities in your state to check on its status.