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I think you can use a feature in Raid Notifier (ultimate exchange - it needs to be enabled first) to show percentages.
What is Raid Notifier and Ultimate exchange?
It is an addon, and ultimate exchange is a feature of this addon, that once you turn on, lets you see the percentages of other group member's ultimates. It's very useful for eg when healers/tanks want to time their warhorns in trials, etc.
I installed Sanct's Ulti Tracker but it keeps making a continual 'ticking' noise! Was driving me crazy so had to stop using it sadly
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Yeah you can mute the sound in game, under game sound options. You will also notice a ping dot on the map, you just have to ignore it. Otherwise the addon is fantastic for shot calling in pvp.