The IRS says 9 out of 10 filers who efile and choose direct deposit will get their Federal refunds within 21 days after being accepted. Some returns are processed fairly quickly, while others require additional processing due to specific items in the return. Some are pulled at random for more thorough investigation. If it's been longer than 21 days, I've provided steps below on how to phone the IRS.
If you efiled, double-check to be sure the return was efiled successfully and accepted.
If you used Online TurboTax, you can sign into your Online Account and check the efile status at the Tax Home.
If that showed it was accepted, you can use the "Where's My Refund" tool at the IRS website below to monitor the status of your Federal refund.
https://www.irs.gov/Refunds
NOTE: When using that tool, use only the Federal refund amount, and not any total refund amount that includes a state refund.
The amount to use is on your Federal Form 1040, Line 21a.
If the IRS tool says it is still being processed, and if it's been longer than 21 days since an efiled return was accepted, here's how to reach a live IRS agent to inquire about the delay, although they are extremely busy due to all the stimulus questions on top of tax-filing questions:
IRS: 800-829-1040 (7AM-7 PM local time) Monday-Friday
When calling the IRS do not choose the first choice re: "Refund", or it will send you to an automated phone line.
FAQ: How do I track my state refund?
https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571