Your Will is unregistered, under such circumstances in Delhi you will have to file an application under Section 276(1) of Indian Succession Act 1925 for seeking Probate orders. As such there are no objection to will you will get the probate easily from court after that you can sell the property and get it registered in sub registrars office.
The application for a probate under Section 276(1) has to be made to the competent court (a pecuniary jurisdiction may require a higher court to issue a probate for high-value immovable assets) through a lawyer. The application must contain the time of the testator's death; a copy of the last will; and the amount, title deeds and documents pertaining to the assets in question.
After receiving the application, the court issues a notice to the relatives of the testator to file their objections (if any), for the granting of probate of a will. A general public notice is also given in a newspaper.
If there are no objections raised and/or if the Court is satisfied that the Will in question has been validly executed, it will grant probate of a will only to the executor named in the Will.