On another forum,
someone posted a photo of the terminals USPS is switching to. Seems to be one of the newer Verifones, but with a camera/QR reader that I haven't seen before on that model (or at least never noticed before). I kinda wonder if they're going to need to swap out the Ingenico readers on the kiosks too before those ever become enabled for contactless.
(I don't expect my local post office to have them yet but I do need to mail something in the next day or two, so I should be able to check.)
EDIT: my post office does indeed have them (and they work):
Unfortunately, there's no indication whether CDCVM was used (or perhaps they only use it over a certain amount).