Minute, hour, day are specifically allowed by CIPM to be used in SI. They just can't be used with prefixes.

kWh is obviously inconsistent with SI conventions if commonly used; but 'kW⋅h' or 'kW h' is completely acceptable. As is 'W⋅h'

A full list of acceptable non-SI units can be found in the brochure here under: "Non-SI units accepted for use with the SI units"

https://www.bipm.org/en/publications/si-brochure