Agent Assist is available for calls and chats that are unassociated with a queue

You can now turn on Agent Assist for calls and chats at the team level. That means that Agent Assist is available for interactions that aren't associated with a queue, such as direct inbound calls and outbound calls with no queue selected.

Administrators: In the Settings > Users & Teams > Manage Users & Teams > edit TEAM_NAME pane, there's a new Agent Assist section.