Is it too late to file my 2019 taxes?

You can efile a 2019 return  until 10/15/2020 and after that it will need to be mailed. 

It's never too late.  If you don't owe - file immediately.  If you owe, Use TurboTax and enter as much info as you can.  And then file an extension.  But enter as much info as you can so you are as close to knowing what you owe as possible.  If you owe, there will be penalties.  But File Sooner than Later.  

Sorry it is too late to file an extension.  Extensions had to be filed by July 15.  Now just file your actual return as soon as possible.

Last day to file an extension was 7/15/2020 so if you owe you need to file ASAP to stop the late filing and late payment penalties + interest from accruing.