Has the Commonwealth passed the harmonised legislation?

Yes, this occured on Thursday 24 November 2011. The federal Senate passed the new Work Health and Safety Bill 2011 (Cth), marking it the fourth jurisdiction to pass the harmonised work health and safety legislation.The WHS Bill will replace the existing Occupational Health and Safety Act 1991 (Cth) (OHS Act). The WHS Bill has been passed in the Commonwealth with no amendments.

Note: 01/1/2013
Queensland, New South Wales, NT, ACT, South Australia and Tasmania have each passed versions of the Work Health & Safety Act