I was just about to ask the same.
If I recall from previous cases it’s a bit like how long is a piece of string as it depends on availability to find time to review the evidence, reach a decision and write up the decision. I would hope it is before Christmas.
If I remember correctly there is one final appeal for either party and that is to the Supreme Court. However, either the CoA or SC would need to agree it was a point of law that was important enough to go to the SC. As there is no case law regarding the specific section in the EA2010 which Allison appealed on it might meet the requirements.
FWS got to the SC because it was a point of law that fundamentally impacted the interpretation of sex in the EA2010.