You want to order on Friday* and receive the delivery on Saturday (valid only for national shipments within Switzerland).
If the calculated postage for your order is 3 CHF, the shipment will be treated as a letter and will be delivered on Saturdays at no extra charge.
However, if the calculated postage costs are 9 CHF or more, you can now have your order delivered on Saturday.
Just add the item Saturday Delivery for 8 CHF to your order.
* Only useful for orders from Thursday 13:00 to Friday 13:00