Soon, Google Assistant will respond to certain phrases without requiring that you say the wake phrase "Hey, Google". As per XDA-Developers, "Quick Phrases" is now rolling out to a Google Pixel 3 XL that was running the Android 12 Beta. It's not known whether Android 12 is a requirement for Quick Phrases. It's worth noting this was also the Google App version 12.39.17.29. Source: XDA-Developers Quick Phrases needs to be activated from the Google Assistant settings. Once enabled, Google Assistant will listen for certain phrases depending on the context. For example, if an alarm...
Source: https://www.gsmarena.com/google_starts_to_roll_out_quick_phrases_talk_to_assistant_without_saying_hey_google-news-51306.php