Want to get height and width of clipping mask not of the clipped photo

I have grouped items that can include photos that are in clipping masks.
I need to get the size of the whole group.

When I don’t have clipped photos, or the photos are smaller than the whole group so they don’t (invisibly) stick out, I get exactly what I’m looking for.
When I try to get the dimensions of the group with a larger photo what I end up with is the bounds as though the photo was not clipped.
What I need to get is the bounds of what is visible, ignoring the parts that the eye cannot see.
I’ve tried height, width, geometric bounds or visible bounds, but they all give the same values.

Is there any way of doing this?