I sent someone a message on Facebook messenger but blocked them before it delivered if I unblock them will they still get it?

So a friend and I got into a fight, I sent them a mean message but it never delivered only sent bc I quickly blocked them so they couldn't write back. And I'm worried if I do unblock, it will deliver the message, will it? Will I have the option to remove for everyone if I do unblock him? Or is it too late?
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