In the older versions of OSX it was possible to get your wireless AP IP address by pressing the option key and clicking the networking button on the top bar, they seem to of removed the AP IP from the displayed info since. What is the new on-the-fly method in the new OS Catalina?
There are two options:
Click on topbar WIFI Icon -> Open Network Preferences and you can see IP Address below Status.
Open terminal and put:
ifconfig | grep "inet "