Despite the rapid growth of voice and virtual assistant adoption, platforms like Google and Amazon have yet to provide businesses with the ability to segment voice interactions from typed interactions in performance reports. This makes it difficult to fully assess the role of voice search and virtual assistants at present, but there are some signals we can use to examine any changes in user behavior and the directional growth of voice interactions.
— Read on searchengineland.com/what-the-numbers-tell-us-about-the-current-voice-search-opportunity-314810