I would associate most of those groups with "psych" which is different than "prog." Pink Floyd tripping out on "Interstellar Overdrive" is something different entirely.
Though come to think of it, "Days of Future Passed" was 1967 and that's certainly "proto-prog" (any time you add horn charts or orchestral bits and get "more complicated than rocknroll" . . . )
"Sgt. Pepper" was obviously a big influence too.
The problem with genre labels is the more you think about them, the blurrier they get!
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