@jeff - Very valid points,But I want to give a chance to it as my server has high-end configuration and no business activity/user land at weekend on server.
I want to do update statistics in parallel as it consume approx 60-70% time of my maintenance plan.
enable the XP_CMDShell at prod shall not be recommended
@Eirikur - Create multiple jobs is very obvious but I don't want to create bunch of jobs at instance.