If you’re still looking around for solutions, I’m one of the developers of Bloom: Store Pickup & Delivery, which lets your customers choose a delivery day (and time if you’d like). It has localization options too for you to translate it into your preferred language.
There is a 14-day free trial if you’d like to play around with the settings and see how it works.
Let me know if you wanted any more information or help getting started.