We don't yet have solid information about the scope of these sets. I would assume they would center on more mainstream jazz and swing artists in the "Jazz Showcase" series. . . but Vanguard recorded into the 'eighties and beyond including groups from 'sixties and 'seventies such as the Dave Burns, the Armstrong releases and the Coryell groups and into the 'eighties with Oregon, etc. Anyway a look at the label's output via discogs.com for example will show possible material. Most likely it will only be selections from the Jazz Showcase series.
Here is the discogs listing of "Jazz Showcase" releases:
https://www.discogs.com/label/191588-Vanguard-Jazz-Showcase?page=1