Since the release of the 1940 federal population census several weeks ago,
indexing has already been completed for a number of states, including
Indiana. Although some of those states are now searchable, Indiana was not
as of May 30. It is believed that the delay comes from a need for final
arbitration and otherwise general tweaking.
You can check on the indexing progress at
https://familysearch.org/1940census/?cid=fsHomeT1940Text_v2. Those states
in the rust color have a searchable database. To access a search, simply
click on the state. You will need to wade through several pages to access a
digital image, but it is there.