Although some reviews claim that the real-time translation feature is unbelievable, like the underlying technology Google Translate, the feature has a lot to be desired when translating some languages, such as Thai, which is "officially supported" by the technology.
Earlier, this real-time feature was only supported on Google's Pixel Buds which were launched past year. As spotted by Android Police, a Google employee revealed on a Pixel support thread that, on October 18, the default camera app on the smartphones will support external microphones.
Existing devices that have Google Assistant support built in may possibly support real-time translations as well, though it's not clear at this point.
Additionally, the support page also gives a list of langauges that are available for real-time translation on all Assistant-optimized headphones and Android phones. Though there are only a few headphones which support Google Assistant, they are Bose QuietComfort 35 II, Sony 1000XM2, JBL Everest 110GA, OnePlus Bullets. However, despite the unparalleled computational photography performance, the Pixel phones have always been lacking one thing - the ability to record audio via external microphones using the stock camera app. Google has heard complaints about the issue and is now ready to fix it. You will need to align the text on the screen and then choose the text which you want to translate. And now, Google is bringing the same functionality to other headphones that feature support for the company's virtual digital assistant. This means Pixel users will be able to use USB-C and external plug-in mics when shooting video on their phones.