Can I purchase TurboTax deluxe early before I receive my w2 or before the I.R.S and my state department of revenue start accepting tax return orders?

Yes, but 2019 program doesn't come out until November and the Online version doesn't open until December.  

 

Do you want to buy the Desktop program or use the online web version?

 

For the Desktop program you can sign up for the Advantage plan where they ship it to you (or you can download it) as soon as its available.  

 

You can pre-order next year’s CD or Download here.

Sign up for an Advantage Account

https://turbotax.intuit.com/personal-taxes/cd-download/advantage/

 

Here's another link explaining Advantage 

 

What is the advantage of Turbo Tax Advantage

https://ttlc.intuit.com/community/choosing-a-product/help/what-s-the-advantage-of-turbotax-advantage