After you file

4 weeks after you print and mail it,  you can start checking IRS Where's my refund     <a rel="nofollow" target="_blank" href="https://www.irs.gov/refunds/">https://www.irs.gov/refunds/</a>

Make sure you are using the refund amount from your actual federal tax return and not the combined amount Turbo Tax showed you at the end.  That was for federal and state combined.

Did you also mail a state return?  Did you mail them in separate envelopes?  They go to different places.  Did you get a tracking number from the post office when you mailed it?