It's a three-day hold until you get a test, and there's not any details out on it yet, probably because they realized that Trudeau's half-assed announcement was not good.
The hold pending test is not a bad idea in and of itself, given the fact that people are literally selling fraudulent testing certificates at global airports, and people returning (or entering) Canada have proven a fantastic ability to ignore the quarantine requirements and do things like host parties at home once they've arrived.
I agree with people saying that charging $2k to do a three-day hold pending test results is costly and the cost is concerning, but again, there's no published details, and given that the government continues to not publish details, I anticipate there are a lot of people in Ottawa panicking about how to implement a program designed to deal with the lowest common denominators (COVIDiots) and not unduly harm everyone else.