Hello,
There is OTA for phone provided on /e/ website.
They target a stable version and there is less update than on the nightly versions.
For my /e/ S7 the last update was in august : https://images.ecloud.global/stable/herolte/e-0.7-n-2019082020896-stable-herolte.zip.changelog
You can get this link and check your phone version in the menu : Parameters > About Phone > System updates > 3 dots > Modification history
