It's this WA: https://wago.io/TMl-ECVnE but based off combat time instead of bigwigs timers, for those who have issues with it not appearing.
Currently set to show 4~ seconds before Echo/BigWigs P2 heal times (~3:36, ~4:24, ~5:16, ~5:50), however this is customisable in the "Custom Options" field of the WA if you want to for whatever reason.
The WA will show 8 seconds before the specified times in the Custom Options, you can change this in Conditions 3 & 4.