This weakaura tracks the duration of all kinds of active / proc trinkets, water elemental, icy veins, arcane power, power infusion, ice block, clearcast and displays an icon while Presence of Mind is activated. Includes trinkets from classic as well.
Each individual icon has their own load condition to only load while you're talented, have a specific skill learned, have an item equipped or in case the case of PI, are in a group (does not actually check if a priest is in the group).
If you want to show a timer, I'd recommend to use the OmniCC addon (or add a %p text in the display of the icon).
If you have any suggestion on other procs / durations to track, leave me a comment here or on the (classic) mage discord.