I don't have the answer to this question, obviously.
This will be part of the negotiations between the governments of Quebec and Canada, as was the case in 1991, when Quebec premier Robert Bourassa entered into a GST and QST collection agreement. As of 1992, this agreement has been implemented and a protocol has been established.
I see this bill as a way of finishing the work started about 30 years ago. It depends on both levels of government.