It doesn’t specify, I’m pretty sure most people consider war arc his peak so far
They made most the jincs look like bitches save for gaara bee and naruto. Gaara was scary in pt1, then by trying to become a better person that part became less apparent, by the time he gets along with shukaku their no longer a duo.
It’s said they have great stamina, which corrolates to chakra. Although madara himself was an anomaly, as I’m sure it’s noted at some point he had a great amount of chakra, and that it was “sinister and evil”. I’d say nardo probably has more chakra than your average uchiha, but not madara