My wife was an Au Pair under a J-1 Visa. We got married in June 2018, she does not currently have her green card, how can I file under married with turbo tax? We have SSN

[LinaJ2018]

If you are a US citizen or resident and your spouse is a nonresident who has been staying in the US less than 2 years, you can file jointly by making a statement to treat her as a resident.  See  Nonresident to resident .  You would not be able to e-file, but paper-file.  Print out all the required tax forms, attach the statement and submit by mail. 

If your spouse carries the J-visa and has stayed more than two years in the US, she is a resident for tax purposes.  Therefore, no filing the statement is needed. You can then e-file.