It depends on your specific circumstances why the third stimulus has not been received yet. These details would dictate the time frame for the check distribution.
For more information, see: Questions and Answers about the Third Economic Impact Payment | Internal Revenue Service.
To contact the IRS, call 1-800-829-1040 and they are open Monday through Friday, 7 AM to 7 PM. For more contact resources, see IRS Let Us Help You. Click this link to determine what is on file at IRS: View Your Tax Account Information.
