The main economic implication of this pipeline expansion and export infrastructure in general is to shrink the gap between prices received by oil producers here and world prices abroad. It's projects like this that shrink that differential, which increases the amount received per barrel by producers here.
This flows through to benefit Canada's economy through several channels. First, to the extent that it facilitates more investment and production in the sector, it's going to mean greater input purchases of goods and services supplied to the sector by businesses located all throughout Canada. There are large interprovincial trade implications. There's also government revenue that is earned federally, primarily through higher corporate income taxes in Alberta through both income taxes and also royalty revenues and personal income taxes paid with the higher earnings of both owners and workers within the sector.
There's various research on how different provinces benefit from oil prices. Of course, provinces like Alberta, Saskatchewan, Newfoundland and Labrador benefit more, as these are larger sectors as a share of their economy, but nearly all provinces benefit from higher oil prices. There is the notable exception of New Brunswick, just because of the much higher share of refining activity that occurs there. It's purchasing oil as an input, but that's kind of unique. Other provinces, including Ontario, Quebec, Manitoba and British Columbia benefit when oil prices are higher.