That is a TurboTax message and not from the IRS. There are forms and schedules on your tax return that have not yet been finalized for e-filing. If you click on the Review tab and go through the interview there will be a screen showing the forms and schedules and the dates they will be available.
See this TurboTax support FAQ for IRS forms availability - https://ttlc.intuit.com/questions/1908854-irs-forms-availability-table-for-turbotax-individual-perso...
