From our experience as publishers and creators of these apps: https://play.google.com/store/apps/dev?id=548828401423122855... I know that the delay is max. one day. Both for rating and installs. I'm sure that the numbers you see in the store now, are from yesterday, but still they don't match.

From what I saw based on my app (released over a year ago), installs lags, but reviews don't. I think installs lag only for a day, but maybe they lag for longer due to some factor such as a different country or a holiday/weekend