AFAIK, Tesla has not announced the availability of a CCS adapter for North America, only for Europe -- and the European one is for use by Model S and Model X (the Model 3 comes with a native CCS plug in Europe). Note that the European CCS is physically different than the North American CCS, as are the European and North American Tesla car-side sockets. Thus, the European CCS adapter would be useless in North America.
There's been speculation that Tesla will eventually release a North American CCS adapter, and some hints from Tesla that it might eventually happen, but nothing even remotely concrete, AFAIK.