You can check if you e-filed when you log into TurboTax. If it says "Take me to my return" then you did not file. If you have filed and log in you will see the Tax Home and can see the Status of your return. If it says "Ready to mail" then you will have to print and mail your return or follow the instructions below to change to e-file.
https://ttlc.intuit.com/replies/5561257
Please see these FAQs for additional information:
https://ttlc.intuit.com/replies/3301375
https://ttlc.intuit.com/replies/3319882
