The border is not closed yet, but they have not ruled it out. Actions to control the spread of Covid-19 are changing rapidly here. The federal Minister of Health is now suggesting Canadians not travel outside the country at all, including to the USA. This may become more than a suggestion. Last year Canadian travellers to the USA spent almost $30 billion and US travellers to Canada spent almost $8 billion.
It would be a major and unprecedented action, since typically over 400,000 people per day cross the US/Canada border in both directions. We are each other's largest trading partner, with almost 20% of US exports going to Canada and almost 80% of Canadian exports going to the USA. So a sealed border would have a huge impact on the economies of both countries. Although no one seems to be talking about impeding the flow of goods and cargo, just potentially people. Almost half of our most recent Covid-19 cases have originated in people returning from the USA.
In the last two days in Ontario, as well as many other parts of Canada, we have gone from fairly "normal" to almost all large gatherings being shut down, at least temporarily. All large sporting venues are shut down. Most museums and many tourist attractions in Ottawa and Toronto (such as Casa Loma and the CN Tower) are now closed. The federal Finance Minister has announced a further cut in the central bank rate and the funding of a major support programme for small and medium enterprises affected by shut-downs and other impacts from fighting Covid-19.
Part of the reason given during the question period by the federal Minister of Health, is that there has been unilateral action without consultation by some "other" countries (read between the lines) and a lack of action and transparency about what is being done in "some" other countries to actively test for and stem the spread of the Covid-19 coronavirus. A not so subtle message, but can't possibly imagine to whom she might be referring.