Purely technically speaking a Fulcrum RRS crankset is no other then a Campa Super Record crankset with their best 10S chanrings.
Same bearings, same everything except the chainrings which quite frankly can be used without a problem in an 11S system.
You won't notice the difference even though I trust Campa when they state there actually is one.....
To answer your question, it is 100% 11S compatible. There is no such thing as a non-compatible 11S Campa or Fulcrum crankset as there is no difference whatsoever to be found in the cranksets. Since there is no no reason to change a crankset for whatever speed anyhow. They're not interdependent.
Now, if you want to turn that RRS crankset into a a 11S crankset all you'd want to buy is nothing really. It will work prefectly as that is exactly why I run one.
Want to run 11S chainrings? No probs.