Dropped Apples
YO Massena, hello from 60 miles north in Orléans, Ontario.
I think this is the tree's way of determining survival of the fittest. In a bad pollination year, the tree would likely keep every apple, but in a good one, it can not support all the fruit that have been fertilized, so it drops a percentage of them. My apple trees are doing this BIG TIME right now, but I still will have apples at the end of the year.
I am not a trained arborist, but assuming that your tree is otherwise healthy, you will have apples at the end of the season.