JL026 operation days : 3 hours before departure time.
JL736 operation days : 4 hours before departure time.
In Town check-in (Hong Kong/Kowloon Station) are closed.
About ferry terminals :
Only SHEKOU (ZYK) to HKGIA is in service
* The other terminals are remain closed.
* All air to sea ferry service remain suspended.
https://www.jal.co.jp/jp/en/info/2020/inter/200318/counter.html#tabs