Hello Yaniv
Thank you for your question.
It is up to you, you can decide when to send your luggage depending on when you need it at the final destination. The station to station offer takes 2 days: Station-to-station luggage | SBB It means if you bring your luggage to Geneva Airport Station today, it will be ready for pick up in Zermatt the day after tomorrow. The first 5 days the storage is free of charge, and then we charge CHF 5.00 for every additional day – up to 30 days total.
I wish you a pleasant day and a good time in Zermatt
EleonoraS