Well, there is now yet another version of USC-C

USB PD 3.1 Extended Power Range (EPR).
This delivers up to 48V at 5A, supporting up to 240W

Apple’s newly announced top tier MacBook Pro models can absorb up to 140 watts of power from a charger but the prior USC PD spec maxed out at merely 100 watts.

Apple was instrumental at proposing the 28V, 36V, and 48V new voltages levels to USB’s working groups

“… There are USB-C to USB-C EPR cables in the works, and as soon as they are available, you’ll be able to use them with the 16-inch MBP charger.”