Seems about as tall as a regular Geth Prime, maybe a bit more~

He's a bit taller, the angle I took this from was a bit under his thighs. Also the assistant is standing right behind him and the bucket is 2 times taller than his head so this wasn't the best way to show his height. I make a better reference of his heights in the near future :)

Heh, for that reference you'll need a banana for scale, and a big ruler. 👀