While I don’t have the exact specifications on my mind, if I recall correctly it’s below 60W.
I’m 100% certain it’s at least 24W as well, as the prototype charger (not final) did deliver 12V 2A.
Finally, it completely depends on what those 2 docs provide in terms of USB-PD voltages - if they both ‘only’ provide 5V and 20V, then the V would likely fall back on the 5V and thus not charge completely.
This is due to some USB-PD stuff that basically states, that you don’t have to have any voltage (I think except 5V) - so it is not ensured that they can charge the V at the maximum rate.
I don’t have a prototype on me anymore, nor did I have a USB-Twinkie on hand, but I think the V should also charge with 15V as my Switch USB-C charger did charge my V (bear in mind it could also just have fallen back to the 5V)