This is a simple question. As the title says, what would it mean in this given context:
A: Can you check this?
B: I'm on it.
In this case, when B says "I'm on it", does he mean he already started the checking and is continuing it, or he will be checking it sooner or later (but not sure when he will be checking it)? What is B trying to convey exactly here? Thanks!
Updated with my research on the web. It seems to me that the phrase could be interpreted either ways. What do your native speakers think?