In short, TurboTax has to receive the form from the IRS. Once they receive it, the programmers have to assimilate the new form into the programs and make sure they integrate properly. So there's a little time involved there. I will say that 2/5 seems a bit long; it doesn't usually take that long. So check back periodically to see if the form becomes available in TT earlier.
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*** 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.***