It’s very important within a business to keep all layoffs a secret until the person is actually gone. It is good for morale not to alert anyone to an impending departure. It’s especially important if that person works with your group.
It will also be expected that all work that person is doing to be picked up and continue as normal once they leave with no interruption in work.
So please be sure you know what all of your co-workers are doing at any given time on all possible projects and work. Because they could be gone.
At any moment.