I just got a 12th gen DIY laptop, brought my own 100W GaN PD charger and use a Chipofy USB C cable which has a small LED screen built-in to indicate how much power is passing through the cable.
In general, the cable has indicated it’s delivering 50W - 60W when the battery is charging. However, I definitely have seen spikes in power usage that peak as high as 95W.
Would be interesting to know if there is an update to the max supported wattage (maybe because TB4 is now certified?) for those that are bringing their own chargers.