Question on an award Ticket for a flight next month
We have 4 members of our party travelling from BOM to ZRH to BRU to JFK.
We are all in Business class from BOM to ZRH to BRU.
Three of us are in Business from BRU to JFK on SN501
One member of our party is in Coach from BRU to JFK on the same flight. We would obviously all like to be in the same class and we paid the mileage for a business class seat the whole way.

My question is this, about how far out from the flight date will Brussels Airlines release Business Class award tix for Star Alliance members. Or do they only have a fixed number of seats for *A members?

Any help would be appreciated.

Thanks for your help in advance. If this is not the right place to post please let me know and I will post in the appropriate place.