even if you can't get that by the time of your interview, you will probably be okay. What they need it for i to convert your license to HK ATP. So if you can't get it in time, call the recruitment people and explain. It will probably be fine if you get it to them when you receive it. They do not actually need it until you are in training.
I never had my record but had the ATP written results and got a letter form a loacl FSDO verifying what licenses I held.