Renewing via serial

My current NIS2011 is due to expire on Tuesday, currently states '3 days remaining'.

 

I have a brand new NIS2011 box with new serial.

 

After Sunday this PC will not be turned on until Thursday morning. I should be able to boot up on Thursday morning and put the new key in as the first thing I do and continue where I left off without any problem shouldn't I ?

 

The new serial is not an 'upgrade' version but a full retail.