You do not get any money for the advance until the IRS accepts your e-file. The IRS will not begin to accept e-files until late January.
You don't get the Advance until the IRS accepts your return and the IRS won't open efiling until late January. And it is not a loan, it is just an Advance on your refund.
See this TurboTax support FAQ - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/offer-details-disclosures-refund-advance-program/L4ljXp6TI_US_en_US?uid=m5im7t6f
If approved, your Refund Advance will be deposited into your Credit Karma Money™ Spend checking account, typically within 15 minutes after the IRS acceptance of your e-filed federal return