Quick Crockpot question.

I had a stew going in the crockpot which my grandmother put on warm. It's been on that setting for about 2 hours. I only just noticed it and put in celery and carrots, then adjusted it to high because it's supposed to be ready in about 3.5-4 hours. Will it be ready?

Ingredients:

• Cubed beef
• carrots
• celery
• beans
• potatoes