This is an easier version of T3550: until we can have ETAs, it would be nice to show how many objects are already cooked, and possibly how many are on the todo-list (though the todo-list keeps growing if swh-graph is unavailable, so probably not great UX in this case)
Revisions and Commits
I think just showing how many are already cooked would be a huge improvement. Then users would at least be able to observe progress happening. The current system just indicates 'processing' so it is not obvious if it is actually doing something or perhaps the task died.