I want to be sure that I have not filed my 2016 tax return. I wanted a professional to review it prior to submission and I want to be sure that it has not been filed.

You can check to see whether your tax return was filed by simply re-opening your return or signing back in to TurboTax. Your filing status should be the first thing you see, it will either say e-file or Ready to mail for your status if you have filed your tax return.  

Thank you

You are welcome.