"In Review" means your file has been fully translated and is now being reviewed and edited by a second linguist for accuracy.
The translated file will be made available when the review step has finished and the project status is updated to "Ready."
See also: I have opened a Translation+Editing project. When will my editing start?
Why should I use Translation + Editing?
I’ve received my translation, so why isn’t my project marked as ‘Completed’ on my projects list?