The proposed regulations were published in part I of the Canada Gazette. That calls for a 60-day comment period that actually ended on February 20, 2019. The CTA probably has quite a wealth of background input from Canadians across the country. They're in the process of reviewing that right now, and I don't know that this would add much to what they've already received.
On April 11th, 2019. See this statement in context.