Take a good book, they get everyone on the morning list in at 7, but you may not go down straight away. It's tedious I know, but it doesn't mean anything has gone wrong. The anaesthetist will come and check you out, and your surgeon will come and mark you up, literally with a magic marker. You will probably also be given some very sexy (not) compression stockings to wear.
All the very best for Thursday, I'm sure all will be well.