As an app player, I don't want this. Timer only shown when sector is locked. There may be many sectors locked in the map. Like continent map, one province showing timer means okay, but in GbG it's not like that. This timer shown only when opting to see sector labels. Anyhow, one extra click to see sector labels in GbG map to see the timer with sector names or labels. Instead directly touching the sector which I need shows the timer in the popup without enabling the sector labels. With this idea, nothing benefit to an app player or PC player. It's like same information shared in multiple place. That's all. Also, Why timer needed only when showing sector names.
Wait, I know what the next comment going to be made for my response. Because opting to see the sector names and displayed with timer everywhere, players can plan well to strike the unlocked sector on time. But the same is happening now also rite. If a sector is locked, just get rid of that clicks to open a sector popup to see timer is the benefit to mobile and PC players. When we opt to see sector labels, now extra load to get the timer of all locked sector with this idea. Current approach is very smooth since based on user choice sector popup opens up and displays the timer and other details irrespective opting to see sector labels.
I don't want another delay in GbG for lazy click of some players. If they implement as a new button to show the timer on locked sector without disturbing the sector names button, I wouldn't mind supporting it.