There are now pages on area 51 that shows the status of beta sites, e.g. the number of questions. They seem to be a bit out of date (not by just a few hours), e.g. the number of questions for Bicycles is wrong.
The progress/stats pages on Area 51 are updated hourly.
A couple days ago, we fixed a bug that prevented the pages from updating for a few days, which is likely what you were noticing.