After all testing is done and if there are no show stopper or high defects open then we can provide the sign off. After that we should prepare Exit document which contains more or less same sections as Test Strategy. Additionally it should have problems faces during the testing like environment issues etc. It should mentioned the number of defects opened & their current status.

If any high or show stopper defect is open then we can provide the conditional sign off.

we can sign off the project preparing the exit criteria with the release notes

Hi

After all the testing process is over then the product will be delived to the client