how much bigger will he get, he’s 10 months now and 41 kilos?
It’s impossible to say for sure how big your pup will be when he’s mature, that mostly depends on genetics. However, from what you say he’s right on the average weight for a 10 month old pup so I would expect him to weigh around 120lbs when full grown.
I’d recommend that you take a look at my Rottweiler Puppy Growth Chart page as it has lots of information on Rottie growth and development.
Best of luck with your pup, he’s a nice looking boy :o)