Being a dig day wont affect your riding, the trails won’t be closed. Work will more than likely be on the Descent Line, but even that won’t be closed.
Definitely worth a trip from Halifax. But like Steve says don’t come if you just want to do a “normal” XC trail centre type route. Be prepared for some tech rocky riding, downhill and uphill. Also be prepared not to do sections first time and to have to go back and try again. You’ll either love or hate the WBT.
Norwood on the other side of the road has some nice “natural” trails, could possibly be muddy at the moment. HTH
And if you do come, say hello to the trailbuilders on your way past 😀