Push Notification support in @pixelfed has been merged 馃コ
https://github.com/pixelfed/pixelfed/pull/5303
iOS TestFlight users: v1.0.0.69 is rolling out now with Push Notification support (if your server supports it)
Android Users: v1.0.0.69 is rolling out without Push support, but does contain several bug fixes. You can expect Push support later this week!
Admins: See https://docs.pixelfed.org/running-pixelfed/push-notifications.html