Ownership/Possession of stock before selling


I have a question about having possession of a stock item before selling. Some stores or wholesalers have a ‘click and collect’ service. So I can pay for the item, and they will keep it in the stockroom for me to collect when I like.

At this stage, would it be permissible for me to sell the item if a buyer is interested, before I collect the item from the store and take possession of it?