I have uploaded an application to AppStore in last Saturday afternoon (29/6/2019). Today after 8 days the status is still "waiting for review". I contacted them and they said they will need more time to review the app. The fact is that they claim in their site that it takes up to 2 days to review an app. Has this happened to any one else?
Reviews have been considerably faster in recent months than they were previously. It used to routinely take a week or more to get a new app approved & several days for an update. Now I find that new apps are generally approved in a couple of days & updates in 1-2 days & sometimes less than 24 hours.
If you are releasing a new app you can make it easier on yourself by making sure there's nothing in it that will cause it to be rejected, because that will add time to the process.