how can I detect keylogger in Macbook Pro 2019 and wipe out keylogger.

Keyboard issue is much more likely. Try an external usb keyboard and test. If that works as expected then it's the keyboard, if not then probably software.

Also, try starting up in Safe Mode and test to see if that works as expected. (It will take a lot longer to reach the Login screen because it does some cache cleaning and disk checks first. But after that it should be much the same as working normally.

How to use safe mode on your Mac - Apple Support

What makes you think you have a key logger. That's almost impossible to do remotely. The only way for that to happen is if someone had physical access to your Mac, did they?