Yes, you can use TurboTax to file just a Quebec return. However, because of the way the Federal & Provincial forms are intertwined in the software you would need to enter most (if not all) of your Federal information again.
We also only have TurboTax Download (for Windows) products still available for 2018. You can see what we have here under the 2018 tab: https://turbotax.intuit.ca/tax/software/prior-year-taxes
