Assuming you have all the necessary CIs, server configuration, Rules and Topics in place, you can schedule your update Job using Calendaring. Go to Deploy/Calendaring to set up your Calendar(s). When launching the Job, you can then select the desired timeslot on Sunday evening from When/Date and When/Time, assuming that there are no restrictions in any of the existing Calendars for that timeslot (where competing calendars exist, restrictiveness prevails over free slots).