Nobody really knows -- at least, not outside of Tesla. There have been some vague promises that Tesla will eventually support "all important charging standards," or words to that effect, but that claim is very much open to interpretation, and of course there's nothing remotely resembling a promise as to when new products will be made available. I seem to recall seeing a post somewhere from somebody who received a vague promise that Tesla was working on such an adapter from a customer support person, but that's nth-hand information from somebody who's likely not involved in the development, and so that information doesn't carry much weight with me.
Personally, given Tesla's history on this and the fact that a CCS adapter is far from required in North America (or any other market that uses the same CCS variety we use here), I'd say it's likely to materialize sometime, but the wait is likely to be measured in years, not weeks or months. Note that CHAdeMO is quite dominant in Japan, so Tesla was highly motivated to create that adapter for the Model S when they introduced it into the Japanese market, and to make the CHAdeMO adapter work with the Model 3 when they began selling the Model 3 there. There's no equivalent compelling need for CCS, AFAIK.
