Layoff notice, what does the 60 days mean? after 10 years as an electrician's helper

Our team was told about a closure date that is 2 weeks away. I worked as an electrician's helper before this. Some colleagues are already leaving. Should I stay for the bonus?

Thanks for writing this out. I went through something close to it 6 months ago, and it got easier once I kept a simple log of every call and form.