If your target device is rooted then you can track deleted messages and can see a new WhatsApp message around 15 to 30 minutes depends on what interval you want to see. But if your device is not rooted yet then you can not track deleted messages and you must wait longer than usual to see new messages. Sometimes it takes 1 day to 3 days.
Notes: please read more about root and social networking apps.
Since March 2020, we have a dedicated support team who will help you to root online (remotely) please visit this announcement for more detail. .