Yeah. If you're going to do it, starting now is good. You can take your time and pace yourself that way. If you ever want to play or maybe even write for anything other than guitar or bass, then you may want to be able to read notes. In my own metal band experience, I wanted the lead guitarist to do a solo over a certain riff that I wrote and if neither of us new what key it was in, he wouldn't know what scale to use for his solo. :)