should include counter workers if it's a Canada Post retail outlet only. If the retail counter is located inside a shopper or something I'm not too sure, since the ones at those counters usually belong to the store it's located in.
As an aside, I have heard that CUPW plans on starting with rotating strikes. I've heard Ottawa may be the first one, but one city will be on strike for sure on Friday. I can tell you it WON'T be Montreal or Toronto yet, unless it becomes a national strike.