From Simon Dodsley (Pure Storage):

The Pure Storage Cinder driver for NMVe-TCP, to be provided as a supported dataplane in RHOSO18, needs patch https://review.opendev.org/c/openstack/cinder/+/877918 to be backported to Antelope (RHOSO18 downstream).

All required os-brick patches required for NVMe-TCP and the Pure NVMe-TCP driver, have already been backported as part of os-brick 6.2.3.

No other prerequisites are needed for the Pure NVMe-TCP driver to work in an Antelope environment.