It might depend on if you are just looking for a traffic light like custom field based on single issues (https://marketplace.atlassian.com/search?query=traffic) or a Gantt chart like display of projects (from your description I assume this is more likely the case).
This could imply using a project management tool of your choice, built upon Jira - for this there are many, many Apps in Marketplace and you would need to see which one fits best for you.
A quite good introduction can be found on Atlassian's pages for project management:
A simple implementation of a red/amber/green marker could be a custom field holding those values, that could be done out of the box, lacking a graphical representation of course.
Project managers know this problem: A “mountain of work” lays in front of you, and you don’t know how and where to tackle them. Different to-dos lie ahead, but just one task after the other can be ha...
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