Zona's pages give neither a set delivery fee nor a set delivery time. Shipping is added at checkout, where you see the full total before confirming payment, and no order is finalized until the payment has gone through. Arrival times are only estimates, and they shift with the city, the courier, peak times, seasons and sale periods.
After the courier takes over your order, you follow it using that company's own tracking details, and if it runs late they help you chase it. Double-check the mobile number and address before paying: once preparation has begun or the parcel is with the courier, changes cannot be guaranteed.
Source: Zona: terms and conditions