It's been released since September 2019.
Please see:
HOL-2030-01-CNA - Containers 101 with Photon OS, VMware's Container-Optimized OS
Use Project Photon OS, the VMware container-optimized operating system, to deploy a classic three-tier application. Explore more advanced topics, such as multi-component deployment and container networking
https://labs.hol.vmware.com/HOL/catalogs/lab/6319
Bill