Google Mobile-First Indexing
Well, Google's Mobile-First Indexing is coming sooner rather than later.
By Sep. 2020 Google says ALL sites will be crawled and indexed using Mobile-First. You can check to see if your site is moved over to Mobile-First in Google Search Console under property settings.
Apparently 70% of sites are already moved. So mobile friendliness is paramount.
If you're following WA best practices you shouldn't have any issues.
Just an FYI...