UCI does not update their rankings/points after every race, they do have set dates when the points are calculated and rankings changed. Team rankings and Olympic games qualification points are updated at the same time when UCI ranking is updated. Sometimes they have a day or two delay as well.
MTBCrossCountry updates all the rankings when the UCI updates are available, in case of technical difficulty it is updated as fast as possible.
How many points is available in each UCI event can be found on The UCI points rules page.