The !bots command shows you how many users are allocated to each of the bots.

Syntax: !bots

Example:

OvEn ToAsT (3:28:05 PM): !bots

toasts aim bot 0 (3:28:58 PM): Bot Name:Users on bot
unassigned:2
146168691:32
toastsaimbot0:120
toastsaimbot1:12
toastsaimbot2:118
toastsaimbot3:109
toastsaimbot4:121