Not sure why Carney was in such a hurry to meet Trump.
a country's leader has two top concerns: security and the economy. for Canada, the US has suddenly become the #1 threat to both. Carney, being a normal, no-nonsense, boring* leader, knows that he can't waste time. uncertainty doesn't help anyone, so best to grab the bull by the horns a figure out a path forward. trump is an in-person, shake-your-hand kinda businessman so Carney grabbed the first opening in trump's calendar.
*Carney is a run-of-the-mill technocrat. he's an economist that could be mistaken for a 60's sitcom father. i'm certain his dad jokes are FIRE (although i suspect that he prefaces them with a warning, "alright, i'm going to be funny now - what do you call...")