Layoff notice, what does the 60 days mean? after 3 years as a nurse's aide

My employer announced that the site will close and gave us written notice. I have read a lot of threads here and could not find my exact situation. I do not know if I should start looking now or wait for severance news.

Thanks for writing this out. I went through something close to it 13 months ago, and it got easier once I kept a simple log of every call and form.