First of all, Please search and review as there are numbers of questions related to this topic or we can say duplicate.
Yes, after your app gets Status Ready for Sale it might take some time for after that the app will be visible as search result. Totally depends on Apple as The delay is due to propagating your application's status across their all iTunes app stores servers. it will take maximun a day.
This is what i learnt from somewhere want to share as Apple cache the data that will shows in the search result on iTunes App store. So I think this will take couple of hours for their caches to be updated.
