Tapping noise?

It sounds like you have a roller follower for the camshaft that has come apart but to be sure can you please shoot a quick video with your phone so I can hear the noise? that way I can tell for sure what's going on. You can upload it here with your response.

Here is how to remove the valve cover to looks for camshaft and roller rocker damage:

Here is a guide on engine noises:

https://www.2carpros.com/articles/engine-noises

and

https://www.2carpros.com/articles/comprehensive-guide-to-identify-and-fix-ticking-and-tapping-noises-in-engines

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.