Hi @krypto-hippo , harmony mining has been postponed from the next Network upgrade scheduled for this October (Blossom) Write spec for Harmony Mining · Issue #3672 · zcash/zcash · GitHub
The earliest it could be adopted, if they could figure out how to do it securely would be NU3 which would be 2020 or later.
Before it was postponed it was discussed at length in this and this thread