Relax. The club have always dispatched season tickets in batches. You then also need to take into account the receivers geographical location.
Delivering to an address close to the ground (Merseyside area), would obviously be easier than delivering to an address further afield.
Take a breath, wait till the post tomorrow. If it doesn't arrive then, relax and see on Monday. If it hasn't arrived by then I would suggest ringing.
By the way, I quite like the design on the front this year. Everyone else agree?