uses 에 System.Notification 을 추가합니다.

procedure SetNotification(Content: String);
var
  NotifiCenter: TNotificationCenter;
  Notification: TNotification;
begin
  NotifiCenter := TNotificationCenter.Create(nil);
  Notification := NotifiCenter.CreateNotification;
  try
    Notification.Name := Application.Title;
    Notification.Title := Application.MainForm.Caption;
    Notification.AlertBody := Content;

    NotifiCenter.PresentNotification(Notification);
  finally
    Notification.Free;
    NotifiCenter.Free;
  end;
end;

SetNotification('알람알람!!!');