Is it possible to know the current status of a Defer

My app runs core async code on C++ (using web assembly). I want to call a c++ async function (returns Defer) from js . I can bind Data types such that js understands (using emscripten embind). Is there something like Defer.status so that my js code can know till when it should wait

Start by reading the Defer API and the C++/JavaScript boundary created with Emscripten embind. Clarify whether a status query or another completion signal is expected, then define done as allowing JavaScript to determine whether the asynchronous Defer has completed.

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