I want to quit my employment at will job formally

Is there any consequences of saying "This is my last week while it is mid way through the week."

Or should I wait till Monday and tell him this is my last week.

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official