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. The IRS Where's My Refund? lookup service provides a specific, personalized date for your tax refund.
If you claimed an Earned Income Tax Credit and/or an Additional Child Tax Credit and filed before February 15, 2019, you’ll get your refund the week of February 27 at the earliest. The IRS states they will begin issuing tax refunds on returns with the EIC or Additional Child Tax Credit on February 27, 2019.
According to the IRS on taxpayers claiming Earned Income Tax Credit or the Additional Child Tax Credit- https://www.irs.gov/pub/irs-pdf/p2043en.pdf
If your return was accepted less than 21 days ago, hang in there. It can take anywhere from a few days to 3 weeks to go from acceptance to approval. This time frame is unrelated to how, where, or when you filed and it isn't connected to how quickly you got your refund last year.
And it doesn't mean you're being audited — the 2018 "audit season" doesn't start until summer.
IRS representatives will be able to research the status of your refund if your return was accepted (received) more than 21 calendar days ago. Call them at 1-800-829-1040, but prepare for potentially long wait times.