Combine delivery date for all products

Hi, first of all great free plugin.

Is it possible if I have 2 products in cart and checkout with different estimated delivery dates to show a message somewhere else ( for example in the shipping cell ) only the one with the latest date for the whole cart/checkout and then in the order email. (to combine them into one and show the biggest estimated delivery dates)?

The point is I send the products once everything is ready, not first one batch of products, then the second to minimize shipping costs for the client or me.