is the latest version supported and compatible in laravel 5.7?
nope
Not yet:

Is this repo even still maintained?
Does anyone know of an alternative package?
Well there was an update about 2 months ago... Don't know of any alternative packages.
Just for you, omaryoussef (with support of laravel 5.7 lol)
https://github.com/megama5/jwt-auth
Most helpful comment
nope