Moving from US to Canada, transition of care

Hi all,
I know this forum has some members from Canada as well and I am looking to seek some answers.
I am on a weekly Herceptin which will go on for next 9 months and depending on Hera results might go on longer.
My husband may be asked by his company to move to Canada anytime soon. We already have a Permanent Residence status in Canada though we still do not have the medical card for Ontario.
Assuming we get the medical card then does anyone have any experience how difficult it would be to shift the care and stay on the Herceptin.

My history is that I was diagnosed with Stage 3 BC. had 4 AC and then 4 Taxol and then started Herceptin weekly.

Also if anyone in Canada could refere some good oncologists in the Toronto area.
Thanks
Rupali