Most recent polls - Galaxy 53/47, Nielsen 54/46, Newspoll 54-46. For each of them, that's their best Coalition result so far this year.
Maybe, as you allude to, they’re all just within the MoE of 55-56. Or maybe we have, collectively, evidence of a ‘narrowing’. Time will be the judge.
I regard the 58/42 Newspoll last week as the real rogue, influenced as it was by Rudd's tax policy announced the previous Friday.