Your best bet is The Lens. The Lens does patent searching like Google Patents, but is much more feature packed. One of the options in Summary View is to sort by "Cited" which list the most cited patents in the current search in order. In addition, there areis a really nifty graphical analysis view which shows a lotlots of other interesting information.
The Lens is my favorite free patent searching site. If you choose to log in (you don't need to), you get other useful features such as saved search queries, search history and collections. It is a perfectly free non-commercial website.
Here is a screenshot of how to sort by cited for the search term "autonomous":