The IRS issues refunds, not TurboTax. This means that we can't say for sure why you haven’t received your refund as of yet. You'll have to speak directly to IRS to find out more about the delay. To track your Federal refund, visit the Where’s My Federal Refund? site here: https://www.irs.gov/refunds. Updates are made daily, usually overnight.
If you have not received an update via the Where's My Refund tool after 21 days of being accepted, you can follow the instructions in the following FAQ to contact the IRS for further assistance.
https://ttlc.intuit.com/community/refund-status/help/what-if-my-irs-refund-is-taking-longer-than-21-days/00/26080