The status time is the time that Autosys handled the last event from the concerned job. This should be close to end time. You can see this also in autorep output.
autorep -J Job1 -d
Job Name Last Start Last End ST/Ex Run/Ntry Pri/Xit ________________________________________________________________ ____________________ ____________________ _____ ________ _______ Job1 08/23/2018 07:28:07 08/23/2018 07:28:17 SU 61/1 0
The end_time of the job Job1 is "08/23/2018 07:28:17". When you look at the SUCCESS event is processed is as "08/23/2018 07:28:19". This is the Status Time you are seeing in WCC.