I suppose the Smooth Jazz format reached its end in most of the U.S. 10-15 years ago. Canada had one Smooth Jazz station in the Hamilton-Toronto market, 94.7 The Wave, but that was also short-lived. It switched to Country in the 2000s.
And the U.K. had a national network called Jazz FM, that became Smooth FM and is now Smooth Radio. But over time, it moved from Jazz to Jazz-AC to now a standard Soft AC sound.
There are a number of Smooth Jazz HD stations owned and operated by Entercom. In NYC, it is heard on WNEW-FM 102.7-HD2. In Los Angeles, it is heard on KTWV 94.7-HD2. They only run public service announcements, no commercials.
But as far as I know, there are only two Smooth Jazz stations still on conventional FM radio in the U.S. WEIB 106.3 in Northampton, Massachusetts, near Springfield. And WSBZ 106.3 in Miramar Beach, Florida, near Fort Walton Beach. Both are in wealthy tourist communities.