I can give you a few figures and some explanation.
According to the UN, money laundering represents between 2% and 5% of GDP. In Canada, that would be $40 billion to $100 billion.
I can give you another figure. It comes from the Canadian Security Intelligence Service's 2020 report, which pegs money laundering in Canada at between $45 billion and $113 billion Canadian. I should mention, though, that there is no agreed upon method for calculating how much money is being laundered in Canada or globally. Some say that the estimates aren't high enough, because what criminals try to do is hide the money their activities generate. Others think the estimates are too high because the same amounts can be recorded two or three times. It's really tough to say exactly how much is being laundered.