The high number in Quebec comes both from having an earlier spring break which boosted numbers initially, and a higher number of tests being done so far. Proper social distancing/prevention measures were put in place earlier than in Ontario, and the curve is likely to flatten around the same time it will for most provinces.
But hey, don't let facts get in the way of your Quebec bashing. Gatineau has far fewer cases than in Ottawa so if you somehow think closing the border helps Ontario more, your bias is showing.