MacOS already have builtinAV protection, this is from the Apple website:
"...runtime protections in macOS work at the very core of your Mac to keep your system safe from malware. This starts with state-of-the-art antivirus software built in to block and remove malware. Technologies like XD (execute disable), ASLR (address space layout randomization), and SIP (system integrity protection) make it difficult for malware to do harm, and they ensure that processes with root permission cannot change critical system files."
But if you have any concern you have the option to install another security level with a third party solution but it could be redundant at least for me, never had a problem with the builtin solution.