Do I need Kaspersky for my Mac?

There’s no malware here. Nothing wrong.

You were offered notifications probably via website, and accepted them, and here we are. if you no longer want these notifications—advertising spam—you can shut them off, and also disable ever being offered these notifications:

Stop unwanted Notifications - Apple Community

As for adding apps, I use the built-in anti-malware, and don’t use and generally don’t recommend add-on apps.

Some reading on how the malware and malware-like apps and scams work:

Effective defenses against malware and ot… - Apple Community

The whole point of this notification advertising is to get you to install something you very likely don’t need, too.