If your target device is rooted, you can track deleted messages and see a new WhatsApp message around 15 to 30 minutes depending on what interval you want to see. But if your device is not rooted yet, 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 had a dedicated support team who will help you root online (remotely). Please visit this announcement for more detail.