If you are signed in to sync on both your devices you can access your open tabs on whatever device you are on.
On desktop there is a button on the start-page called "Tabs" which will list all your devices and their open tabs.
On mobile you have to open the tabs menu (the button that will show all your open tabs) and click the button with arrows on it. This will bring you to the other devices page which will show all open pages on your other devices.
Ah, wonderful! After closing/opening a tab on my mobile device it needs some seconds (sometimes more, sometimes less) till the list of the opened tabs in the desktop version will be updated.
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Vice versa I often used a bookmarklet to create a QR code and switch to the page on my mobile device via — of course — a qr reader 🙂 Not the quickest way (and Google get the URL, too), but it works, too 🙂
Thanks a lot!