Does anybody know how security updates work with these devices? I assume Samsung will continue supporting S7 and S9, but for how long, and do these patches make

Does anybody know how security updates work with these devices? I assume Samsung will continue supporting S7 and S9, but for how long, and do these patches make it to /e/? I'm always skeptical of privacy grandstanding when little information is available about the security properties and processes of a system. One can have security without privacy, but certainly not the other way around.