Unlike Instagram, where you can browse profiles freely, BeReal operates on a "give-to-get" model.
If a user sets their post to "Public" before sending it, their daily BeReal will appear in the tab. This is the only official way to view posts from people you aren't friends with. BeReal App Review: Full Tutorial
Your profile picture is public and can be seen by both friends and non-friends. Better Methods for Viewing Profiles
You cannot see your friends' daily BeReals until you have posted your own for that day.
Mastering the BeReal Experience: Better Ways to View Profiles and Posts
While third-party "viewers" often promise more access, the most reliable and safest ways to view BeReal profiles involve utilizing the app’s built-in features: 1. The Discovery Feed