Tested on the Apple 87W and 30W USB-C Power Adapter, when the battery is below 50% it charges at around 29 watts and was able to hit about 30.44W on my generic RavPower USB-C adapter. Not sure why Apple only advertises the 20W on the iPhone page but I will stick with the 30w for the slightly quicker charging times. (*Edited to add that I been using the 30W Apple adapter on my 12 Pro Max which can charge at a maximum of 25W for the past year and it is at 97% Battery Health.)
60% Battery - charges at 25W
70% Battery - charges at 17W
80% Battery - charges at 10W
90% Battery - goes below 10W and slowly tapers down
60% Battery - charges at 25W
70% Battery - charges at 17W
80% Battery - charges at 10W
90% Battery - goes below 10W and slowly tapers down
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