There is stalling, but much blame lies with Provinces and Municipalities that were put on notice months before the Federal election that Federal Legalization was coming, and especially after the April 2017 announcement.  

Considering most police forces are doing just fine dealing with a relatively benign, ubiquitous, and uncontrolled illegal regime, the transition to a legal framework will pose few real adjustment from the current norm.

Police will have the easier job of enforcing ID limits and public use according to the law. 

More serious enforcement issues will be determination of impairment, which are already being dealt with every single day, and will continue to be dealt with in the future by applying the technology of the day.

As to home growing, the Canadian Courts completely denounced Police expert witnesses espousing the dangers of home grown marijuana.  Concerns around home growing are easily dealt with through local safety and nuisance codes.