Where can I check to find out if I submitted my taxes?

[Critter]

Check your spam folder. When you e-file your federal return you will receive two emails from TurboTax.  The first one will say that your return was submitted.  The second email will tell you if your federal return was accepted or rejected.  If you e-filed a state return, there will be a third email to tell you if the state accepted or rejected your state return.

First, check your e-file status to see if your return was accepted: 
https://turbotax.intuit.com/tax-tools/efile-status-lookup/

If the IRS accepted it, what does it say here?  
https://www.irs.gov/refunds           

Or does your account say “Ready to Mail?” 

[mya0912]

It said not filed

[Critter]

Well then you can log in and complete the FILE tab to submit the return  or choose to mail it.