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No, you won't receive any reply from the staff...The only way to know it is by looking at the post you reported, if it's gone then someone act on it, if it doesn't, maybe no one is around to handle your report or if nothing happens, check your report to moderator stats, if your accuracy is declining, then most probably your report was not correct/accurate...
To do so, after some time, like a few days just try to report one post to see what is your accuracy. Just choose a random post and click "report to moderator" and you will see your accuracy rate, no need to report anything if you are just checking. If you have 100%, everything is good. If it is less than 100%, the mod has considered that the one you reported is not breaking the rules.