Canada has not deposited its instrument of ratification yet. However, 19 other signatories to the multilateral instrument have deposited their instruments of ratification. The first five deposited them in the first half of last year. The treaty itself entered into force on July 1, 2018. However, even though the multilateral treaty is in force, it has no effect in respect of any of Canada's tax treaties until such time as Canada ratifies, and it is entered into force and effect.
On February 5th, 2019. See this statement in context.