Do the executors in a Will need to necessarily see or be privy to the Will?

By way of general comments, no, the executors of a Will do not necessarily need to see or be privy to the Will before the death of the testator (the person who made the Will). The Will is a private document and the Testator can choose to keep it secret from anyone, including the executors. However, it is generally a good idea for the testator to let the executors know about the Will so that they can be prepared to carry out their duties after the testator's death.