I thought they just wintered south and returned up north to lay eggs, we don’t get any around here.... ever
Canadas, unlike most other species of geese are known to take up permanent residence all over the country. There's a rather large population living on Rockefeller refuge on the gulf. I've also seen small flocks on several ponds around here.
To answer your question Anthropic, all waterfowl will go to nest in the spring. Exactly when that is depends on the location. I've seen goslings as early as late March down here. It depends on the prevailing weather and length of day for the most part.
Being that your birds just showed up, they're likely to leave once their clocks tell them it's time to migrate back to wherever they came from. But its possible you may have one or two mating pairs decide to stay.