Decide now who is sending, not on the day
The couple should not be sending messages on the wedding day. That sounds obvious and it is still the most common reason updates go out late or not at all.
Hand it to one named person before the day: the planner if you have one, otherwise a parent or someone in the wedding party who is not in the first look photos. One person, not three, because two people sending updates causes more confusion than silence would.
Give them the login and a short written list of what to send in which situation. Ten minutes of preparation removes the entire problem.
Write the messages before the day
Most wedding day updates fall into a handful of predictable categories, and all of them can be drafted in advance while you are calm.
The rain plan: CEREMONY MOVED INDOORS to the barn, same time, same address. The delay: ceremony starting 30 minutes late, no need to rush. The directions: entrance is the second gate past the white fence, not the main drive.
Having these written means the person sending them is copying and pasting rather than composing prose while the photographer is waiting for them.
The updates guests genuinely need
Weather changes, timing changes, and where to physically go. Those three cover almost everything that matters on the day.
Parking and shuttle information is the most underrated. A message the evening before with the first pickup time saves more confusion than anything sent on the morning, because guests plan their day around it.
What guests do not need is a running commentary. One message that the ceremony is delayed is useful. Three updates about how the delay is progressing is noise.
Timing, and what this cannot do
Messages go at 12pm Eastern on the date you choose. That works for a morning-of message set up in advance and for the evening-before reminder, both of which are the ones worth sending.
It does not work for something happening at 3pm that you decided at 2:45. For genuinely live coordination, the person on the ground with a phone is faster, and that is what the coordinator is for.
There is also no way to message only part of the guest list, so a message about the after party reaches everyone unless you set up a separate list for it. Scheduling messages in advance covers how to line the timed ones up.
Vendors and the wedding party are a separate list
The photographer, the caterer and the band do not need the same messages as the guests, and the wedding party needs different information again.
Running a small separate list for vendors is worth the extra dollar if there are more than a few of them. For a wedding party of eight, a normal group chat is usually simpler.
The guest list itself is the one worth setting up properly, and building that list covers how guests join it and what to send in the weeks before.