Yes, you can.
Here are instructions on how to print a copy of your tax return to mail to the CRA in TurboTax Online:
1. On the left side menu, select File, and then select CRA Online Mail.
2. Continue through the interview until you get to the Filing Hub page. There, click the Print & Mail your return(s) button.
3. Click on the Open a PDF of your federal return for printing link to open/save a PDF of your CRA barcode return.