When will ZOHO invoice offline be available?

When will ZOHO invoice offline be available?

Basic features like creating/editing invoices and recording payment should be available offline with the ability to sync with the cloud when the program is back online. We should have the ability to do simple data entry in the program, it doesn't require wifi. Some of us don't have at all times (Ex. travelling/commuting) and we still want to work on our accounting. 
When can we expect this offline feature to happen?
This is one of the only problems I have with ZOHO invoice so far that makes me want to use other program to do my invoicing instead