Partly built: part of this depends on a connection or a switch that may not be on for your account yet. The article says which part.
When your loved one is signed in on their own (with their own key or number pad, or on a device the family marked as the patient's), each phrase spoken is recorded for the circle: which phrase it was (a library phrase or one of their own words), its category, where it came from (the library, their own words, a quick tile or a saved message) and when. The device keeps a queue and sends it every 30 seconds and when the page closes, so it also works when the Wi-Fi drops and catches up later.
A message the patient types, builds from sentence starters or spells on the Letters board is counted as one message and nothing else: its words are never recorded. What is written on the Letters board or on Write is never stored at all. The one exception is Couldn't find it: a typed Communicate message that matches nothing in the library or in their own words is kept, word for word, for the family to add (see the article on it).
From those records the app builds a summary for a chosen stretch of time: how many phrases were spoken, how many messages were typed (a count), on how many days your loved one used it (the days in the patient's time zone), the most used categories, the ten most spoken phrases, the words added to their own words, and — for the owner and the caregiver role, or the speech therapist when the family's switch is on — the things they looked for. The account owner, the caregiver role and the clinical logins on the care team can read it; family and friends accounts and an agency's office cannot. Lessons and practice are shown as zero for now, because that progress is kept only on the patient's device.
Not yet: the care team's dashboard view of this summary is still being added. Until it appears there, the summary is not shown on anyone's screen. The Most used and Recent lists on your loved one's device are separate and stay on the device.