It can be found by going to Classes Your class Reports Activity Summary Report. This report allows you to track students' typing speed in a class.
There you can use the filters to view aggregate school data for a selected time frame, show the growth on detailed view, and export the report into a spreadsheet. To assess the speed of your school, go to Analytics Schools.
If you have a subscription to edclub's School Edition, you will have access to advanced reporting tools to monitor your students' progress in terms of typing speed.