the phrase "in order" would not typically be used in this question. Rather, "Is it appropriate to call him now? Is it appropriate for him to speak now?" Using the word appropriate infers that you are trying to determine the social acceptability/norms of calling. However, if you were asking this question in a more casual sense, you would simply ask "Is it OK to call him? Is it alright if for him to speak now? Should I call him now? etc.