delay restart on SEP SBE client after upgrade?

I'm preparing to upgrade all the client worstations to 12.1.4a after upgrading the manager. I was asked if the users will need to reboot immediately or can they choose to delay the restart.

I know in the Enterprise version you can set it in the manager to allow them to do so but not in Small Business Edition. However I don't recall if the users will be prompted for the restart and could then choose to delay it or does it just happen immediately.

Thanks in advance,

Michael