But the marvels are only on earth-5 now,or also on earth DCU? And earth-5 is in the present or in early 50s?
Variations are present on multiple Earths. Trials of SHAZAM! is a continuation of modern Captain Marvel. Earth 5 appears to be Fawcett Continuity, unsure of the era. Jeff Smith's Monster Society of Evil most likely takes place on another unnamed Earth.
Same goes for Earth 4. On New Earth, The Question Vic Sage recently died to create a legacy character in Renee Montoya. However on Earth 4, another Question Vic Sage exists more akin to Steve Ditko's interpretation mixed with Alan Moore's Rorschach.