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Yes, they would be edible, but not likely be a very tasty Plum.

Victoria plum trees are biennial fruiters, which means they tend to have a very small crop one season followed by a bumper crop the next. It sounds like you're in a bumper year. For now the best thing to do is try to keep up with picking the fruit. In future years when you see a lot of fruit starting to set, go through and remove about a quarter of the fruit when it's very small (about pea sized). This will make the remaining fruit bigger and save the branches from breaking. You can read more about Victoria plums here:
https://www.chrisbowers.co.uk/article/the-essential-guide-to-growing-victoria-plum-trees/

This article will help you.
https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-pruning.htm

It is most likely Peach Leaf Curl. This Fungal infection will also infect plums. This article will help:

https://www.gardeningknowhow.com/edible/fruits/peach/peach-leaf-curl.htm

This looks like the disease Xylella Fastidiosa. This is caused, usually, by leafhopper insects.

There isn't really anything to treat the disease, but you can maintain the symptoms. This article will help:

https://www.gardeningknowhow.com/plant-problems/disease/xylella-fastidiosa-disease.htm

This article will help you to care for the tree:

https://www.gardeningknowhow.com/edible/fruits/plum/growing-plum-trees.htm