Is imklaunchagent spyware?

See, that is the problem with the Internet, someone didn't know that this is a normal macOS launch agent and decided to label it spyware. It is not, nor is it malware. There is even an operating system man page about it:

Depending on your download habits, you may have installed an application that was not from the original developer site, and it may have had adware/malware as baggage. That likely would not appear in Activity Monitor. Windows malware cannot execute on your Mac.

You could download and run the free Malwarebytes application. It is not anti-virus software, which is not needed anyway, but it is purpose-built to look for and remove adware/malware content. Then you can uninstall the application from your Help menu.

Uninstall Norton.

JackMBP19 wrote:

Y

It's useless, causes performance issues, interferes with the built-in security, false positives, can damage the OS to the point it will need reinstalled.

Effective defenses against malware and ot… - Apple Community

As VikingOSX noted, don't believe everything you read. Especially on the internet.