I don't think police are going to give a detailed timeline. Her phone/bank accounts not being used since Karen was reportedly last seen (by her prime suspect husband) are standard lines used whenever a person is reported missing. Just means that they were not used after that time, but they may not have been used earlier that morning either, or even the previous night.
The point they are making is that she was not communicating, did not grab a bunch of money, suspicious and worrying circumstances had arisen.
I think I recall that police had asked neighbours for their CCTV recordings from the day
before Karen was reportedly last seen, as well as the reported day of her disappearance, and after. I am just having trouble finding that link now. But I believe it was mentioned around the time they spoke of Karen's car being caught on CCTV leaving the residence on the 29th June.
ETA: All I can find right now is this sentence, which may insinuate that police had collected CCTV that did show Karen's movements a day or so prior to her disappearance. But I believe there was something a bit more specific.
Police have reviewed CCTV footage taken from the area, but cameras had not captured Mrs Ristevski’s movements on the day she vanished.
https://www.facebook.com/permalink.php?story_fbid=1260072567337607&id=121286957882846
Melbourne Crime News FB page