Oracle released the Oracle E-Business Suite 12.2.10 Vision Instance VM Appliance. This is the first Vision Instance VM Appliance with 19c Database released in E-Delivery site. Previously released 12.2.9 has 12c Database.
However, in OCI if you are using Oracle EBS Cloud Manager you can launch Fresh Database or Vision Instance with different combinations of EBS versions and Database version including 12c, 19c.
It is a good time to get hands on with 19c Database in Oracle EBS 12.2.