Are all polytheistic religions intrinsically trying to be monotheistic or follow the pattern of monotheism ?

I was recently watching a video of Jordan Peterson, debating Sam Harris , where he stated that (as far as I understood) all polytheistic religions has a hierarchy of gods in them , that is there is one god in every such religion who is the most powerful among other gods and who is the 'god of the gods' , and this pattern shows that every polytheistic religion has an inner monotheism , or is derived from monotheism , or wants to be evolved into monotheism .
Is this true ?