One wild cart ride later they stood blinking in the sunlight outside Gringotts. Harry didn't know where to run first now that he had a bag full of money.
(Harry Potter and the Sorcerer's Stone)
"Now that" means since. Then the highlighted sentence can be replaced by "(1) Harry didn't know where to run first (2) since he had a bag full of money." Semantically, this is somewhat awkward; I think that (1) cannot be the consequence of (2).
What's the exact meaning of the highlighted sentence?