Just got an update for my GW4 Classic.

Here is the screen shot of the update
485207614e6bf6fc487f0e9cbf810818.jpg
 
FWIW, I got the updates yesterday morning and I am on the Watch 4 Classic (46mm) BT/WiFi (non-LTE) version. :D
 
I just checked and it looks like it's just for the Classic version. Only see info on doc.samsungmobile.com for Models SM-R890 and SM-R870. Anyone see ANY info for the SM-R875 (44 mm)?
 
Is yours branded to T-Mobile? That may slow down updates. Hopefully not.

I wasn't aware that carrier-branded versions exist, but I did recently return my Samsung-purchased watch and buy one from T-Mobile, so it's possible.