E-file is now LIVE in TurboTax but keep in mind that the IRS will not open for E-Filing until January 29th, 2018.
The estimated 21-day period to receive a refund is calculated from the date the E-File is successfully submitted to the IRS--and not necessarily from the date it is submitted in TurboTax.
For more information please refer to the IRS Website:
2018 Tax Filing Season Begins Jan. 29, Tax Returns Due April 17; Help Available for Taxpayers
Where’s My Refund?