finding and outputting max point for plot over line

I’m seeing this issue once again. I think I confused the question above (move the line slightly). Let me ask this:
If I run a plot over line filter, I return something that can be plotted on a 2d lineplot. I want to find the maximum value of the output of the plot over line filter, and possibly length down the line.

@cory.quammen @utkarsh.ayachit @Kenneth_Moreland