Before showing a date
Build the estimate from real fulfillment time.
HBN: Estimated Delivery Date combines processing, transit, working days, cutoffs, and holidays into a customer-facing range near the buying controls, where the answer can still influence a purchase.
Start with the normal path
Enter the processing and transit windows the team can actually meet, then account for working days and the daily cutoff. A believable storewide baseline is more useful than many speculative exceptions.
Keep the storefront answer short
Choose a concise template and style it to fit the product page. Shoppers should see the expected range; the operational calculation can remain behind the storefront block.
Add precision where fulfillment differs
Use targeted rules for products, variants, collections, inventory states, or countries with different lead times. Reusable holidays and the simulator help confirm which saved rule wins.