The RPG books cover the world up to and including Small Favor. Your Story will not spoiler too badly, though every now and again there are examples which include scenes from the books. Our World will do a lot more damage, since it lists all the people and nasties we see up to that point.
If you read them, maybe you can take up the mantle and GM for a while, at least until your GM is caught up? Since you would be running your own game, there wouldn't really be any spoilers, and that way you would get to play.