At the moment, my understanding is that the digest email is sent at a fixed time on a Sunday. It isn't clear whether this is Pacific Time or local time. For us (in the UK) Sunday morning PT would be late Sunday afternoon local time. Even Sunday morning feels a bit late - if there are assignments which need to be completed, it would be better for parents to be notified at the start of the weekend rather than near the end.
Could we please customise when the email is sent?