On a MacBook with a notch, Warashi puts two numbers right beside it, CPU on the left and memory on the right by default. They hug the notch so your app menus keep their space.
Open the mini dashboard
Hover the notch for a moment and it opens downward into a mini dashboard: CPU, memory and power with the last minute, and the three busiest apps. Move away and it closes. Click it to open the window. When an alert fires, the notch opens by itself for a few seconds with the reason.
The island on other displays
On displays without a notch, such as an external monitor or a Mac mini's display, Warashi shows a small black island in the middle of the top edge, where a notch would be. It works exactly like the notch.
Choose what it shows
In Settings › Notch you can turn the glance and the island on or off and pick the metric on each side.