Here is the link to the Forms Availability : IRS forms availability table for TurboTax individual (personal) tax products
Once a form is finalized by the IRS, it has to be coded into the special language the software uses and has to be thoroughly tested for calculations and e-filing acceptability. The IRS then has to approve it for e-file. It always takes a little longer for a form to become available for e-file in a software program. The dates are subject to change due to all that needs to be done.
Additionally, the IRS will not start processing returns until February 12, so waiting for this form is not slowing down the processing of your return.