When buildings are getting upgraded, the upgrade only takes effect if it finishes before the attack phase of the war. I don't know what happens with heroes.
If my heroes finish they upgrade at the attack phase of a war, could I use them to attack the same war? Will they be the previous level or the new one?
Clash of Clans – Upgrading Heroes During War: What You Need to Know
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Best Answer
When heroes are upgrading:
They cannot defend the village from regular attacks
They will defend your village in war at the level they were when preparation phase finished
They cannot be used to attack on war nor on regular attacks.
If your heroes upgrade gets finished on war attack phase
It looks confusing, but actually is pretty simple. You'll get used to it.