You want to minimize the time where employees who are not being laid off are wondering “am I being laid off?”. Ideally you want that time to be 0, because it can wreck havoc on morale and those 24 or 48 hours of doubt can be enough to push people who are not getting laid off to reach out to their network, recruiters, etc. Now you’re losing high performers.

If indeed everyone was told “check your email over the weekend to find out if you’re laid off or not”, that’s terrible. Tell people who are being laid off that they are being laid off, tell people who are not being laid off why there are layoffs and that they’re not a part of it, but don’t keep everyone in the dark - even if it’s “just” for a day or two.