With Odoo how we can manage our production capacity in order to give correct delivery date to our customer 

Exemple

I have 1 work center capable to produce 1 unit per day .

I get one customer how asked me to buy 1 unit , MO is created and scheduled to be delivered tomorrow (Good Ok)

In the same day an other customer how asked me for 2 units.

Odoo create the second MO and show to me that he will be produced after 3 days 

But he will be delivered tomorrow also !! (which is worrong as  the MO he will be finished only after 3 days ) 

What is best configuration or modules that allow me to correctly calculate the correct delivery  date  based on my production capacity ?

I want to get this information on my sale orders before planning the prodcution as my customer want this information and also it's not visible to my sales person , he don't have access the the manufacturing module and he don't know the right production date ? 

How Odoo manage this kind of cases ?