I installed PostgreSQL via the graphical install on http://www.postgresql.org/download/macosx/
I see it in my applications and also have the psql terminal in my applicat
Mojave, Postgres was installed via
brew install https://raw.githubusercontent.com/lembacon/homebrew-core/bede8a46dea462769466f606f86f82511949066f/Formula/postgresql@9.6.rb
How to get psql in your path:
brew link postgresql@9.6 --force