Objects dont’ have a normal, but you can select all the objects and switch to “move object centers only” and scale outward – this will move the object centers out from their (cumulative) center point -
“move object centers only” is a toggle button, just left ofthe translation/rotation/scale widgets. It looks like 3 dots with left/right arrow underneath
First I couldn’t get this feature to work, but then I realized I needed to first do a “origin to geometry” operation for my objects. This was because I created the objects from a same initial object by using PKEY to separate them and thus all my objects shared the same origin point.