Following the global rollout of RCS on Android’s default texting app Google Messages, end-to-end encryption began beta testing. This means that only the recipients of a Chat are the ones who can see message content. Any interception of the messages’ transmissions would be scrambled and undecipherable without the decryption keys.
As 9to5Google reports, end-to-end encryption for Google Messages is no longer in Beta. Android’s YouTube channel releases a video explaining encyrption, and the support page no longer mentions that you must join the Beta channel for E2EE on Android Messages.
Messages that are end-to-end encrypted will show a pad lock right on the Send button. Both recipients need to have Chat features turned on, as well as have an active data or Wi-fi connection. If either party is offline, the message will be held until the connection is reestablished. Users can opt to send the message via SMS/MMS, but the message won’t be E2EE. Group Chat Messages won’t be encrypted either.
Google can't keep or get the keys or even metadata as messages are sent through your carrier's servers. Google can never get their hand on it (including the metadata
Dude, does the software work. Messages are actually sent through your carrier service's servers
Small detail: Google will have copies of the encryption keys.