I just tried this today - 12/10/18 - and it seems faulty.

It wont be fully ready until sometime in January.  Wait for program updates.

Has it been updated?  And if so, at what point during the filing process should we expect the deduction to be applied?  Thanks!

4/14/19 It doesn't seem to work.  Spent 2h with TT support today and they have pushed me onto the Offline version which I now have to make happen at the last minute, but I can't find the download (supposedly for free with small business edition) and I guess no guarantee TT offline will calculate QBI there either.   I think this calls for a class action suit against TT for failing to calculate this deduction, and showing no indication to customers  that it is not working so Most people will not notice that they did not get it.