How do you handle offboarding time

Working on onboarding and offboarding and automations to cut down the related work. Offboarding gets a bit unique when it comes to time- For voluntarily separations, we usually want to handle those at end of day. That would seem easy enough to handle, to get last day from the offboarding form and use a timer to count until then? - or maybe scheduled flows
For some separations, we need to make sure we don’t touch anything until we have more precise timing- locking out accounts after the user has had their separation meeting. I can think of a couple different approaches, and I’m curious how other people have handled this.