Will my supervised probation end?

In general, your probation is not terminated until you've completed the terms. It sounds like you haven't, by not completing the classes on time. Not only is your probation unlikely to be terminated, but you could be facing a probation surrender hearing for failing to complete the required conditions by the end date. That is likely a violation of your probation. Speak to your attorney.

In general terms, the length of a probationary period is set by the sentencing judge at the sentencing hearing. A probationer cannot terminate probation unilaterally on his or her own volition, even though all of the specific conditions of probation may have been satisfied (such as payment fines and fees and successful completion of classes and programs) unless the sentencing judge specifically provided for such termination.
Regarding your case, I suggest that you contact your defense lawyer and ask him the exact date that your probation will terminate. You should also ask if there is any possibility that your case can be brought forward so that the judge can order for early termination of probation. You may also ask your probation officer these same questions. And for practical purposes, it is always advisable for a probationer to develop and maintain a very positive relationship with the probation officer (who is in a position to control one's destiny).

The simple answer is that your sentence, once served, ends by its own terms.
If you want to terminate probation early, then you speak to your lawyer about it.
Generally speaking, if you've complied with all the terms of your probation, I doubt it can be prolonged. The state cannot make you serve a longer sentence than you've been meted out in the judgment of conviction.

The probation will not automatically end once you finish all the classes and pay all the fees. Once you finish the classes and have no other conditions left on your probation, you can file a motion to end probation early. The judge may or may not terminate the probation early. One of the purposes of probation is to make sure you do not get charged with any more crimes for a certain period of time. Accordingly, a judge might not terminate your probation early just because you have paid all the money and done the classes because he wants to see if you can stay compliant with the law for the entire length of probation. Note: ff the original end date of the probation comes around and you have paid all the money, done all the classes and completed any other conditions of your probation, it cannot be extended unless there is a violation of probation pending. Contact and attorney to file a motion to terminate probation early and make sure you keep a good relationship with your probation officer in the meantime as a probation officer's position on a motion to terminate probation early can make the difference between it being granted or denied.
Good luck,
Dominic Pang