Thanks! We are using Woocommerce.
I think we have spent about a week on different google searches and we have found several plugins, but most plugins lets the customer choose theyre delivery time, but we dont want that. There are also several plugins where you use shipping class. We tried out labeling our producers as a shipping class and connected the products to set producer (shipping class). That worked great on product not in stock! Then it shows delivery time, but it didnt work with products in stock, then both information was revealed to customer and got confusing. Then it says “Delivery time 3 weeks” and “4 in stock” underneath eacother for example .