!!!!!!!! Idiocy hazard!! I just edited this, to the correct figure of 54 mm, NOT 44 as previously. I have nut widths on the brain today, or something. Sorry for any confusion.
To the nearest whole millimetre, it's 54mm
Actually, so very close to precisely 54mm that I think it's ok to just call it 54 exactly. Tiny variations will arise if saddles are angled.
So as far as your picking hand and your pickup are concerned, it's just like a Tele.
While we're here, might be worth mentioning that the neck is around 1.5mm (1/16") wider at the body than a Fender, which is really nice; just a bit more playing surface and sense of security on the edge strings.