I haven't received my refund yet

[KatrinaLO]

TurboTax gives you an estimated date for receiving your refund based on a 21 day average from your date of acceptance, but it can take longer.

Once your federal return has been accepted by the IRS, only the IRS has any control.  TurboTax does not receive any updates from the IRS.

To track your Federal refund:   

https://www.irs.gov/refunds

https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions 

Once you've confirmed your return has been accepted, you can begin to track your refund. The IRS issues most refunds in less than 21 days, although some require additional time. Please see below for more information on tracking your refund: https://ttlc.intuit.com/replies/5340655

[TerukoL]

The IRS releases most refunds within 21 calendar days after the e-filed return has been accepted. Some refunds will take longer than 21 days to be released, depending on individual circumstances.  TurboTax does not have access to any information regarding your tax refund once it has been submitted and accepted by the IRS and state department. 

Please read the TurboTax FAQ, listed below, to learn how to track your refund with the IRS whose release date has been longer than 21 days.

https://ttlc.intuit.com/replies/3302084

https://ttlc.intuit.com/replies/5340655