I went ahead and just filed the federal for now. I used the online version and on the left where it says file, click it, it'll give you the option to file by mail or e-file, select by mail, then it'll give you an option to change your filing status again, so change the Maryland to file later and keep Federal as e-file, then proceed to file your federal. My federal was accepted in less than 2 minutes. You just have to keep checking back to file MD whenever the updated form will be ready which it should be already updated.
