Do you have to wait until the IRS open in order to get the advance

I believe so.

 

See this resource for more information: 

Offer details and disclosures for the Refund Advance program

 

The IRS is not officially accepting returns until January 29. 

 

Yes.  Then you don't get the Advance until AFTER your efile is Accepted by the IRS.  The IRS  won't open until Jan 29.
https://turbotax.intuit.com/refund-advance