No, exporting reports to Excel is not implemented out of the box. Report Center has stayed unchanged for a number of years. 

There is a code solution for it in this blog: https://world.episerver.com/blogs/Henrik-Fransas/Dates/2016/3/create-custom-report-in-mvc-with-excel-export/

I've been thinking about the report center lateley and it must be the feature I've used the least in all my years in Episerver development. I really think it has potential to be a very useful feature for editors / site admins.

Excel export out of the box would be nice and why not the possibility to setup and schedule the report so I for instance would get an overview om broken links in my mailbox every week.

I agree Per! Transforming the Report Center into a query builder with export possibility would greatly increase its potential.