Your original sentencing order from the judge spell out the period of probation. The DDMP cannot extend that supervision period. Your probation and any monitoring under DDMP terminates as of the last day of your probation. Your monitor also may instruct you to reduce or cease your reporting to them before the end of probation, but that is up to them.
I agree with the first answer. However, it would be interesting to know when you probation period ends. If it is not coming up, you can apply for an early termination by Motion to the sentencing judge. As an aside, be aware that, although unsettled, most MD jurisdictions allow a violation of probation for anything done, or not done, during probation to be filed by your agent within 30 days of the end date.
This response is based on information provided. Many variables may exist that can only be addressed in an interview. This answer in no way creates an attorney-client relationship.