Will End-to-End encryption protects your message before it delivers?

Most probably my answer will be Yes. Now let me explain to you on what basis and how End-to-End encryption is safe? But still, I would like to safe nothing is safe on the internet. Because anything which is connected to the internet it can be hackable. But it will help you up to some extent limits.

  Since your message is encrypted with a lock before sent and the key is only with the recipient, it will protect your message till the time it delivers.

End-to-end encryption (E2EEE) is a system of communication where all the computing users can read the messages where only communication users can read the messages. The messages are encrypted by the senders but the third party won't be able to access/decrypt them and stores them encrypted. The receipt retrieves the encrypted data and decrypts it themselves.

A skilled hacker can compromise the server.  Likewise many issues questioning the WhatsApp and other Instant messenger security and privacy have come up recently. The fact that it has millions of users makes it a target for hackers who seek to carry out cyberattacks on a number of people. The fact that instant messaging has younger generation users will attract online predators. Also, anyone in control of a WhatsApp server can add people to a private group with minimal effort. The confidentiality of the group is broken as soon as the uninvited member can obtain all the new messages and read them. With all its positives and negatives WhatsApp has evolved as the most popular messaging service for millions of people all over the world.

 Next question that arises is where are these messages stored till the time these are delivered to the recipient? 

These messages are stored in the WhatsApp server till the time it is delivered and it will be stored there till 30days from the date of the message.