This WA gives you a vertical bar filling up as you gather stacks of Answered Prayers (assuming you've gone for the full 2/2 talent), which begins to glow at 45 stacks.
When Apotheosis is activated either by hitting 50 or by manually activating it a bar appears on top that follows the remaining time of Apotheosis with a brighter glow so you don't miss it.
AP Tracker Bar based on a Lightning Shield tracker, but updated the trigger to use less CPU than checking every frame. https://wago.io/SJOEVqMDQ