If search report of the SBI has approved/cleared the property and the bank is willing to give you home loan, you may safely go ahead and purchase this property.
Since, this flat (once constructed)will come in the share of the land owner, any Agreement of sale that you enter into is going to be between him and you.
No possession certificate will be given to the land owner by the builder. However, once the project is complete, the concerned competent authority will issue the completion and the occupancy certificate.
Just in case, to be fully ensured, you may get done the title search of the property from your end as well. Contact a local Lawyer to do so.