Naruto is the fastest ninja in running speed, if his KM speed with only Yang Kurama was compared to Minato's FTG then imagine full Kurama powered BSM that is being further increased with Rikudo senjutsu. Senjutsu enhances all of the body's capabilities (strength, speed, endurance, durability, recovery rate, and increased power of all jutsus); so Naruto base speed would be increased to the levels as his strength plus using Shunshin would be enhanced from Senjutsu making jutsus stronger and it gives Naruto a higher reserve which allows him to put more chakra for more speed if he wants. Now full Kurama chakra which is 2x that of Yang Kurama and much more powerful chakra is getting his chakra reserve further increased and made even more powerful.
Naruto's full speed shunshin is crazy fast going with all I observed but he never went full speed after getting full Kurama.