If you efiled, what do you see when you double-check with this tool to be sure the return was efiled successfully and accepted?
If that showed it was accepted, and it's been longer than 24 hours since acceptance, then it should show up in the IRS WMR tool here:
Be sure you are entering just the Federal refund amount, and not including any State refund.
And be sure you are using the actual Federal refund amount without regard to any TurboTax fees if you chose to pay any fees out of the refund.
View/print your return and look at the actual refund amount showing:
If you filed a Form 1040, the Refund Amount is shown on Line 76a.
If you filed a Form 1040A, the Refund Amount is shown on Line 48a.
If you filed a Form 1040EZ, the Refund Amount is shown on Line 13a.