Six of the nine planned books in the series are published! Here are links to each of them.
Philosophy of Mind : published September 2019
Ethics : published December 2019
Logic : published November 2020
Philosophy of Religion : published December 2020
Aesthetics : published December 2021
Epistemology : published August 2021
There are three more books planned:
Metaphysics (undergoing peer review)
Philosophy of Science (still seeking authors)
Social and Political Philosophy (still seeking authors)