Hello all! I am new at this so please bare with me. I'm planning an ANA RTW trip next September. My plan is to fly in biz class as much as possible. It seems that I'm too far out for biz award availability.

Should I book the trip now (mostly coach available) , set alerts in expert flyer for biz availability then call to make the upgrade changes as they become available?
-or-
Should I wait a while before I book the trip?

TIA