In a webmaster hangout on YouTube, Google’s John Mueller said that the mobile-first indexing rollout had nothing to do with Google’s recent ranking algorithm update.
He also said that the mobile-first indexing rollout is still happening. He said that the rollout should be fairly smooth, i.e. you shouldn’t see many ranking changes:
“In general overall [the mobile first rollout] should be fairly smooth. But I I believe they only started rolling this out like I don’t know this today, tomorrow, this week sometime. And not before the blog post went live. […]
We already had some sites rolled over to mobile first indexing. This is just a next bigger batch of sites that is happening. The plan is also to send the messages through Search Console. I believe they’re behind there, so it might be some sites over this week and send them a message next week or something like that. But in general you should get a message for that. […]
My guess is that [Google’s recent ranking algorithm update] is unrelated to the mobile first indexing change.”
You can view the video here:
What should you do now?
Make sure that your web pages can be parsed by Google’s mobile bot and that Google finds the right content on your pages. The tools in SEOprofiler can help you to to that: