According to this TurboTax FAQ, you "should" have been asked during your return preparation if you wanted to be notified by email when the forms are available.
https://ttlc.intuit.com/replies/3299968
If you didn't have that opportunity, or failed to respond, you can check proposed forms availability dates by using the information below.
https://ttlc.intuit.com/replies/3319876
I'd recommend checking back periodically around the proposed date of availability to complete your e-filing.
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***
