Yes the timeframe has shifted from Tuesday to Monday. This is largely due to the models catching on to the splitting of the energy. The first piece will form a system that will pass to our north heading for northern Quebec. We will be in the warm sector which will bring us showers overnight Sunday into Monday morning until the cold front behind the first system comes through. The second piece will be riding the frontal boundery. Currently it is looking like we'll get 5-10cm of wet snow later on Monday.
This all being said, there is a fair amount of disagreement with how all this plays out so stayed tuned.