We don't know if any J-20A with WS-15 are in service or not -- we know that J-20A with WS-15 has been in production since the beginning of the year at least, but we often have a time delay of months or sometimes years for deliveries of aircraft from the factory to units to be confirmed.
We do not know whether we will see J-20A with WS-15 this year at Zhuhai.
For all we know we might not see J-20A with WS-10 either. Or maybe they'll decide to be contrarian and showcase no 5th generation aircraft at all at Zhuhai this year (no J-20, no J-20A, no J-35 or J-35A etc)