There isn't any roadmap showing when the stable release of the new Edge will be, at least not available to normal users, but since your profile says you're a Microsoft Employee I guess you'll have a better chance messaging one of the Edge team members :)
our best guess is it will come out some time in 2020, when the Windows 10 20H1 will be released (the current insider fast ring) and hopefully it will be integrated into the OS. (the new Edge is already replacing the old Edge in 20H1 insider builds).
