Product availability and shipping time

I'd like to show on each product how quickly I can dispatch it. It should look like:

Availability: Usually ships within 24 hours

Availability: Usually ships within 3-5 days

I realise I can do this in the product description, but I really want to place it in the area below the image where the model, weight, stock level and manufacturer is listed.

Does anyone know how I can do this?

I am using the Zen Cart 1.3.9d without any addons.

Has there been any solution for this one?
I'm sure this is a question many times asked but I can't find it in the forum many times, so maybe it is used different words for the description.

Many webshops generally have this kind of groups for shipping time, like certain products belong to group A that is fast 3-5 days delivery and then like B group of 5-10 days and C group of 11-20 days for delivery. Anyone has this kind of solution? It is kind of basic control for the webshop owner.

Elli