All change-of-address filings are handled by the USPS®, not MYMOVE.
You should receive a confirmation email from the USPS® shortly after your change-of-address is filed, letting you know your request went through.
If you have yet to receive such an email, your question would best be answered by the USPS®. You can direct all change-of-address questions to 800-275-8777 or changeofaddress@usps.gov.