It's really a crap shoot if any specific retailer supports contactless, no major metro system that I know of support direct debit / credit contactless cards and no major bank or credit card company issues contactless cards.
If you want to use contactless in america, you add the card to apple / google / samsung pay and use your phone for NFC payments. I get a feeling that america will do a 'leapfrog' in contactless and go directly to smartphone only contactless cards than ever issue a contactless card in the mass market.