I understand how great it would be if tags are shown in the account register. However, viewing tags connected to your transactions in the account register is still unavailable since tags track things at the transaction level and have no impact on your books. You can only see tagged transactions by running a Profit and Loss by Tag Group or Transaction List by Tag Group report and by opening or editing your transactions manually.
For the time being, I advise you to provide our software engineers with your feedback. Here's how:
1. Open your QuickBooks Online account. 2. Go to the Gear icon and select Feedback. 3. Type in your suggestion and click Next.
I'll also add articles you can refer to for future use if you want to learn more about tags: