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You can go to the GOS App Store, choose the Messaging app, click 3 dots at the top and choose the Alpha release channel to get it now

It's in the alpha channel. Go in to the 'App Store' app, go to Messaging, 3 dot menu and change release channel.

They mentioned you can use the Alpha from their app installer.

Good to know! For others: You open their app store, go into messaging, hamburger menu, select release channel, and choose alpha.