What is "jam temp' está"
What does this mean, it looks like it means "already time is" but that makes no sense and why does it use está instead of estas?
It's an allusion to a song Zamenhof wrote in Proto-Esperanto in 1878 called Lingwe uniwersala meaning "It is [already] time". It's used as an idiom in modern Esperanto. The four surviving lines from the song are:
Malamikete de las nacjes, Kadó, kadó, jam temp' está; La tot' homoze in familje Konunigare so debá.
The Wikipedia article on Proto-Eserpanto talks about this specifically among other things.