I gather that there are two (somewhat related) definitions of mind-body duality:
1. mental phenomena are not physical
2. the mind and body are distinct and separable
Neither of these claims are supported by modern science in any meaningful way. It is perfectly reasonable to say that mind-body duality has been disproven by science, insofar as it is reasonable to say anything has been disproven by science. Just because neuroscience is still in its infancy doesn't mean there can be no established foundations of the discipline. These foundations may turn out to be wrong or incomplete, but that doesn't mean we shouldn't talk about them.
1. mental phenomena are not physical
2. the mind and body are distinct and separable
Neither of these claims are supported by modern science in any meaningful way. It is perfectly reasonable to say that mind-body duality has been disproven by science, insofar as it is reasonable to say anything has been disproven by science. Just because neuroscience is still in its infancy doesn't mean there can be no established foundations of the discipline. These foundations may turn out to be wrong or incomplete, but that doesn't mean we shouldn't talk about them.