You can book them starting at 90 days before check-in, but make reservation for up to 10 days without having to call day by day. It is not 97 days prior to check-in or 100 days prior to check-in.
Just as you can call at exactly 11 months prior to check-in and book a DVC room at your home resort for up to a week, where as before we had to call day by day from day of check-out.