Found following ways...
1 - Visually inspect the file system in server.
#DI Server
ls -l /home/pentaho/data-integration-server/tomcat/webapps/pentaho-di/WEB-INF/lib/kettle*
#BA Server
ls -l /home/pentaho/biserver-ee/tomcat/webapps/pentaho/WEB-INF/lib/kettle*
2 - Transformation way - "Call endpoint" step