M’Benga still wears blue. Chapel wears white, but she’s also a civilian contractor in SNW and hasn’t joined Starfleet yet, so how her uniform color interacts with everyone else is unclear.

I guess it existed in the DIS era, starts to get phased out by the SNW era (we see Nurse Chapel wearing white but not Dr. M’Benga), and then is phased fully out by the time TOS rolls around.

At least until the LD uniforms come, and they partially reintroduce it in the form of white boots.