Further to what others have said up-thread, you must have a "credible quarantine plan" when you cross the border (such as your own house/apartment), and you need to immediately go into quarantine WITHOUT STOPPING TO BUY GROCERIES or other supplies.
This story is from about four weeks ago, but still an interesting read:
https://www.macleans.ca/society/life...ity-of-canada/
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13F