No specific timeline announced yet. But in the latest announcement on J-AIR IFE enhancement, it does mention JAL will start to offer free wi-fi on its international flights in the near future.
https://press.jal.co.jp/en/release/202406/008139.html
JAL Group plans to further enhance the in-flight Wi-Fi service by increasing the speed of connectivity on domestic flights and offering free access on international flights in the near future. By continuing to explore diverse inflight experiences, this commitment aims at enhancing convenience and comfort for passengers, while innovating to add new value to air travel experiences.