Hi. I have a work permit valid until November. Then my Non immigrant b visa is valid until February next year.

I will finish working with this company and not renew my work permit.

First question - Do I need to inform labour department to cancel my work permit even if I work until the very last day or it automatically expires?

Second Question - Do I have to leave the country once the work permit expires or I can stay until my non immigrant b ends in February?

Third question - Do I need to cancel my non immigrant b visa by notifying somehow as I plan to apply for a DTV in the future?

Thank you so much