Does anyone here knows when they going to release warrior of light in global server?

Global's around 2.5 months behind JP, so I'd say late-June; give and take some.

I really doubt anyone actually KNOWS when WoL is coming out in global version, but you can make educated guess with JP release schedule that WoL banner release happens in 1,5 to 3 months time. Most likely around 2 months mark from 20.5.
Check this sites page for release schedule to make your own deduction when he's most likely to come to global:
http://wotvffbe.gamea.co/c/bmt2x05z