I was speaking to the help team last night around 21:30 about my own line and they're showing as available now.
If your browser isn't refreshing to show when an agent is free, I'd recommend trying an alternative one or at least clearing your cache and cookies. Keep an eye out for any pop-up blocking settings you have activated too in case that's preventing the chat sessions.
Alternatively, let us know about any queries you have here. If it's account specific, I've sent instructions on how to reach my team here.