Is this catapillar on my onion plant?

in Fruit & veg
I noticed this caterpillar (I think)
on my onion plant, my onions are planted next to my peas though in a separate raised bed (hurst geeen shaft). I noticed some maggot in the pea pods when I was shelling my harvest this afternoon. But it would appear I’ve found the culprit on my onion plants; I started the onion from seeds, will this damage the plant? Also I’m inclined to clear my peas bed because I don’t want to waste the space if the product will be full of maggots.
Please advice.

Please advice.
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