This post goes over how to open Android Emulator on macOS.
Prerequisites
You already installed Android Studio, updated the tools with the SDK Manager, and created a virtual device.
Open Android Emulator
List the Android Virtual Devices (AVDs):
~/Library/Android/sdk/emulator/emulator -list-avds
You should see something like:
Pixel_3a_API_33
Pixel_4_API_33_1
Open the emulator:
~/Library/Android/sdk/emulator/emulator -avds <AVD_NAME>
Replace
<AVD_NAME>
with one of the AVD names from the list.
For example:
~/Library/Android/sdk/emulator/emulator -avds Pixel_3a_API_33