Hello have anybody join the Google messaging beta program yet ?

Google Messages is progressively deploying that update that introduces comprehensive chat themes and personalized chat wallpapers. This phased rollout strategy allows Google to identify and address any potential issues. Therefore, it is normal that you may not yet have access to these features.

https://us.community.samsung.com/t5/Samsung-Apps-and-Services/Google-Messages-Chat-Themes/td-p/3602749?src=ShareByUserCM

Will we be able to change the font soon?

Right!! i see the official date for Google messaging take over is tomorrow

As @Pianodude58 stated themes and other features are being rolled out

Yeah i can't Chang the text background yet either and I've been on the betas since, well, forever lol

Same, on beta and nothing yet

Same

Samsung betrayed all users by replacing Samsung Messages with Google Messages. It is a nightmare!
It's time to get an iPhone.

Ate the forced change to GM, joined the beta did all the steps still... "Nothing." Totally discouraged with Samsung. I purchased this new unlocked phone in Jan 26 without knowing about the messages service changing, if I had this many years long time dedicated Samsung user would not have purchased this phone. Hopefully when I upgrade next time there may be a better option other than Samsung or iPhone.