Can you update the meta tags all at one time?

I don't see any particular reason why you couldn't so in my opinion yes, you can.

How do you do it using site spinner

You can handle the most common meta tags in SS using Page Editor > Title, Meta Tags tab. More information in Tutorials here. Some of the meta tags can also be included in the header. It depends on what meta tags do you want to include.

I see how to update a single page for the meta tags but not multiple tags at once

Now I understood your initial question . In SS basic you can't. If you work with SSPro you can place the meta tags on a page as a Code Object (selecting 'in Header' placement) and then include the object on the pages where you want to have your meta tags.

oh thanks back to updating each page