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If google is happy with your site in its mobile friendly testing tool https://www.google.co.uk/webmasters/tools/mobile-friendly/ Then i would think google would be pleased enough to not hurt your rankings, also if you see the 'mobile-friendly' label next to your site on a mobile device would be another indication. Although i would think having your site suitable for as many many devices as possible would improve your user experience and have further positive effects on CTR'S, Bounce rates etc Hope this helps, James

Hi there Along with the Google Mobile Friendly Test that Dirk suggested above (which I HIGHLY suggest using during this time), I would also take a look at Google's Mobile SEO Guide, particularly in the Signal Your Configuration section. From the sounds of things, you might want to look at the Separate URLs section. It's super easy to read and provides examples. There is a LOT of helpful information in there that can help you prepare your website and take advantage of best practices. Hopefully this helps! Let me know if you have any questions or comments. Good luck!