Do you claim him as a dependent on your return? The first 2 Stimulus payments are only for dependents under 17 on Dec 31, 2021. The new 3rd Stimulus is still going out in batches.
Keep waiting. See
https://www.irs.gov/coronavirus/get-my-payment
Info on the new March 2021 3rd Stimulus payment
https://ttlc.intuit.com/community/tax-topics/help/how-will-the-stimulus-package-impact-me/00/1393859
