It is now way past the expected maintenance time (it should now be 02:23 AM PST according to my time converter at https://www.worldtimebuddy.com/pdt-to-cest-converter).
Game still 'under maintenance, no patch available to download yet, and no information update at http://onigiri.cyberstep.com/home
Some update from Cyberstep would be appreciated, if they ever read this...

Updates:
- no change an hour later, this is now eating in my prime time for online games...
- another 2 hours later; it is now 05:12 PST according to my time converter, making it over 8 hours since the scheduled time for the start of the maintenance; still no update info on the website, and game still offline. The only difference is that now, the launcher will not even start if I try it (task pending in Task Manager, but neither launch/load screen nor error pop-up).
- I tried last another hour and half later, at which point it eventually worked; however, when trying to update this post at the time, the forum systematically logged me off when I tried to go to the 'Help & Support' section... (tried 4 times login again and trying again).

Last week's one was pretty bad and made me miss the login bonus =/ I hope we get something good for compensation.