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You won't see much bokken or jo work from Yamaguchi sensei at Okinawa Aikikai in Okinawa, although I believe Michael Veltri sensei teaches weapons at his Okinawa Aikikai DC dojo. Do not be dismayed however; there is much to learn from Yamaguchi sensei without weapon work.
Some folks think that if you want to learn how to use the katana or jo correctly, you should probably learn those things from a good koryu instructor, not from a gendai budo instructor. I happen to agree with that school of thought. People that are really good with weapons will tell you that most aikidoka's weapon work is mediocre at best. If weapon's work is your thing, look around there in Okinawa. Hang out at the Okinawa City Budokan and the Naha City Budokan and see what's available.