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showed in Google SERPs as "Mobile Friendly" in less than 48-hours
Where are you seeing these results?
I have an older, inexpensive phone and I wasn't seeing any "Mobile-Friendly" labels either. But I found that if you use the emulator in the Developer Tools of the desktop version of Google Chrome, when set to emulate an appropriate device, the label will appear in the SERPs.
If you don't have a modern mobile phone, use Safari. Turn on the development tools. Then use "User Agent" in the "Develop" menu to change to an iPhone user agent and you'll see the mobile friendly tags.
In Firefox, CTRL+SHIFT+M ttoggles the viewport.
What's your experience of switching to making your site appear as "Mobile Friendly"?