Estimated Delivery Date ‑ Plus

It's might be good for the simplest shops but not for the even medium.
The main issue the app fully ignored connection to the shipping profiles which is crucial for defining the estimated delivery.
Also there is an issue with product templates: if you have more than one (default) product template, it's gonna work only in the (seems) random one. There is no way to it will work in other templates. Maybe some coding would help though.

If your shop is small enough, without shipping profiles, without product templates - then it's gonna perfect for you. Free plan is generous and the visual part is good enough.

parfais, juste dommage qu'il n'est pas en francais dans ma boutique, mais les temps de livraison sont correctement affichés

This is a great Shopify app/add-on! The only this it needs is at least 15 more categories. Once they do this, I could recommend this app to anyone.