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You would be surprised what a tree can survive! The injury will not likely kill the tree. That seems to be a very old injury that has already recovered.

There is nothing to be done at this time, but here are some articles to help you with the care of the tree:

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/growing-leyland-cypress-trees.htm

Unfortunately, your photo did not come through. I assume that you mean bagworms, though. This article will help:

https://www.gardeningknowhow.com/plant-problems/pests/insects/treatment-bagworms.htm

I'm not really seeing anything out of the ordinary for these short lived trees. I can't see the rest of the tree to check for any other signs of damage, but it looks fine to me.

Just be aware that after about 20 years, these trees will, seemingly, die suddenly as they reach the end of their lifespan.

Here is an article for more information on the tree:

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/growing-leyland-cypress-trees.htm

Ah, that is a nice, clear photo! These are very short lived trees. They are very likely to contract infections, and by the time it is treated, fully, the tree will be old.

Don't peel the bark, though. This will destroy its nutrient transport layer, which is just under the bark. No bark means no nutrients, and the quick death of the tree.

You can treat with a little wettable sulfur and dolomitic lime, according to all packaging instructions. It will prolong the, already, short life of the tree.

Yes, this is one of the conifers that will appreciate some shaping and pruning! Here is an article that will help:

https://www.gardeningknowhow.com/ornamental/trees/leyland-cypress/pruning-leyland-cypress.htm

Unfortunately, your photo did not come through. I am unable to see the damage.

This article will help you to tell whether your trees are dead or not:

https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm