If everything set up correctly it shows a line such as:
Last update from SVN(4.1): Monday 21 December, 2009 07:05:20 UTC - REV 23971

If something like v8.0beta (SVN) suffices you can use the version option of the module poweredby.

Ref: dev:Update

(Fixed for Tiki 10)
TortoiseSVN 1.7 changed the way the SVN client stores the meta information. An SQLite database is now used to store the information. To access this information the "sqlite3" PHP extension must be enabled.

When using TortoiseSVN 1.7 or higher, the SVN detail information is only displayed when the PHP extenstion sqlite3 is enabled.