tbh I don't think we are going to get much out of Meta until they get close to a holodeck VR experience, or a mainstream-ready AR experience. I'm sure they could drop a chatbot in the next six months, but being able to compete with google/microsoft is going to be hard.

Apple is going to update siri in two years with an LLM and act like they are the saviors of the universe

Amazon is someone that I see get left out of this a lot. They have the resources and funding to make Alexa a search/chat bot as well, and it's right up their ally.