After the tentative allotment is released, you can generally expect to receive your original certificate from the TFC (Temporary Facilitation Center) once the final admission process is completed. This typically involves verifying your documents and confirming your admission in the allotted institution. The exact timeline can vary based on the institution and the specific admission process. To get precise information, it is advisable to contact the TFC directly or check the official notifications from the relevant admission authorities. They will provide the specific schedule and procedure for the return of your original documents.