The advice from the Australian Government Department of Health is clear: if you feel unwell, you should not be entering an aged care facility.
Even if you aren’t feeling well, there may be other reasons for you to stay away from the elderly, including if you have travelled to at-risk countries recently, or if you believe you have been in contact with an infected person.
Even if these do not apply to you, you should still call the staff on site to enquire whether there is a confirmed or suspected case in the facility. They can advise you on what precautions you ought to take as a result, should you be planning to visit a friend or family member there.