Canada Post has now stated that they are " ... advising commercial customers and Canadians that mail and parcels in or entering its network will have long and unpredictable delays before being delivered.
... [we expect] the worst delays for mail and parcels will be for items that originate or are destined for southern and southwestern Ontario. This is because the country's largest and busiest mail and parcels processing plants, in Toronto, have the highest volumes and have been left idle repeatedly for several days by the union's rotating strikes. As central hubs for the entire country, they see a disproportionately large flow of items.
... As early as the end of the week, Canada Post may be unable to honour pickups and induct items in the GTA due to lack of trailers and space."
https://www.canadapost.ca/web/en/comm/details.page?article=2018/11/19/last_ditch_efforts_t&cattype=s...It is that last bit that is most likely to spur the government to act - incoming mail being completely shut down in the busiest areas - but of course none of us can say for sure what will happen next.
Currently on strike:
Chatham (ON)
Kelowna (BC)
Kitchener-Waterloo
Scarborough (ON): Markham Delivery Centre (31 Brodie), Richmond Hill Main and West Beaver Creek facilities
St. Thomas (ON)
Woodstock (ON)