The number of static tags of any device can be found by going to the device property. Additionally, if you are on the latest versions of Kepserverex and launch Quick Client from the device, you can browse the System tags like _System_ActiveTagCount, which will provide the tag count for the same device.
The total number of tags defined in the project can also be viewed in the Project properties. For more information, you can refer to the article at https://www.ptc.com/en/support/article/CS320959.
Let me know if you need any further clarification.
