Season of Discovery - Battle of Ashenvale API?

Back in Classic AQ I wrote the C’thun Stomach Sync WeakAura for relaying information about C’thun’s stomach tentacle health. I want to try to write something similar but for the Battle of Ashenvale status. I cannot seem to find any API calls that actually work for determining what the current % towards completion is (when not in the zone) or what the battlefield state is when the event is actually ongoing. As it functions right now only the former is helpful since it ends in about 20 seconds, but if/when that is fixed I’d like it to relay all information if possible. Are there any API calls that might be helpful for facilitating this?