It's not too late, per se, but we're definitely in the take-what-you-can-get booking window. If you have your heart set on a long stay without moving in a hard-to-get category, it's probably not going to happen. But if you're willing to move during your stay or can be flexible on dates/resorts/room sizes, etc, you've got a good shot.
As for the points, look at the charts, not the calculator. They'll tell you what you need to know. They are per night.