As far as I know, the tests are still being validated in the various labs, so testing has not started per se. I know that it is one of the priorities of the immunity task groups to know what is the prevalence in health care workers. I know that there was a group in B.C. that tested health care workers to look at that sort of prevalence, but across Canada, for something that's pan-Canadian, we don't have data yet.
On May 25th, 2020. See this statement in context.