I'm in Montreal and got mail today (it was a diploma so had to sign for it at the door). They already started but it depends on where you are. They already started in Winnipeg, ON for "symbolic reasons" (first place to have a new mail processing machine, which is a source of their grievance, installed), then Hamilton. They are doing it in a "rotating" fashion. Don't know which provinces/cities will be affected next....
"The Canadian Union of Postal Workers today made it official: Canada Post workers will go on strike at 11:59 p.m. ET, starting in Winnipeg. The strike will then continue 24 hours later in other locations that have yet to be announced."