If you have or are e-filing your return then you would not be required to mail in the tax return. If you plan to file your taxes by mail, you would then need to print and mail your return before you would receive a refund. Below you will find two Turbo Tax articles that you may find beneficial. One explains the e-file process when using TurboTax Online, the other explains the process of mailing your return when using TurboTax Online.
Here's how to E-file
https://ttlc.intuit.com/replies/3301375
Here's how to File by Mail
https://ttlc.intuit.com/replies/3401713