Three have enabled 5G in my area and the speeds are decent but nothing like the potential of 5G, I assume its because the backhaul isn't too decent.
Max speeds I've seen is 260mbit down on the mast I can see from the window.
My device is a MU5001 with a smarty sim and I've seen it as high as 800mbit dl and 100mbit upload on another mast, so its not the device limiting me so unless they upgrade the backhaul it looks like I'll be in the 160-260 range for now.