Play that out a bit. Is the notification a scheduled slack message or email for those terminated? Or do you want each employee being let go to be notified in a face-to-face conversation with their manager and where the details of financial arrangements, healthcare continuity, and other aspects are prepared and with a chance for the employee to ask questions, and for HR and leadership to assess if they appear in a condition to commute home and offer other transport or acute support arrangements if needed?

I think the latter is more appropriate, but a series of those things takes time to execute [longer if managers or layers of managers are being eliminated], and the time between when the first such meeting ends and the last such meeting begins, people are left wondering.