If approved for the Refund Advance, you should get your funds typically within 48 hours of the IRS accepting your e-filed return. You should also receive an email from Credit Karma when your Refund Advance funds are available.
However, we have received reports of a number of customers not receiving their Refund Advance after the IRS accepted their return. This experience is under investigation and we hope to have more information very soon. Thank you for your patience.