According to the website, they are canceling 7 days prior, if the resort remains closure during your trip, if you have not,
So, it doesn’t appear they will cancel you out until then...or, at some point you might be contacted to see if you want to modify the trip...which won’t be until after they open up reservations.
If you know you are not going regardless, you can cancel. If there is a chance you will go or adjust, then I would say no harm in waiting until they will cancel you a week before check in.