The code looks correct to me, but I still have to learn the new depsgraph API. @Sergey Sharybin (sergey) should say if this is the right usage.

Can you elaborate why you are yielding original objects instead of evaluated?

@Sergey Sharybin (sergey): these are later selected [ see best_obj.select_set(True) ] -- which only works for originals I assume?
(but I guess this could be changed so that getting the original is done later?)

Probably indeed better to go original later, when is actually needed.
And maybe add a comment about why original is needed there.

P.S. Was just somewhat confusing to see iterator yielding original objects which has no modifiers or anything in an example which is related on ray casting (which tests intersection against geometry).