Yes. The portal gives clients their own view of the schedule, so they always know when you're coming.
The Appointments view
Under Appointments, clients see their visits — upcoming and past. Opening one shows the details: the date and time, the work planned, and who's coming.
These are the same visits you schedule in Fieldsity. Book or reschedule a visit on your side and the client's portal reflects it — no separate confirmation to send.
Tip: Fewer "what time are you coming?" calls — point clients to the portal for their schedule, and pair it with the Text Messaging add-on for automatic ETA reminders.
Related: Reschedule or cancel a visit.