TO ONE WHO OWN A CAT PLS HELP

Okay my cat has been missing for 2 days now, he's never gone this missing long before. He usually doesn't stray far from his home and i would find him by clapping. He has a collar but im so scared he might have gone stuck onto something. I don't usually let him out but he's a cat, he goes to high places and sneaks out. I didn't really mind cus he'd often stay in the roof of my house or my neighbours. I called him 2 days ago, no response and i thought oh it's night he must be somewhere sleeping. Hoping he'd come home tomorrow but none! I asked my neighbours if they saw him but they said no. So im here freaking out where is he, do i post missing pictures? Or do i wait another day to confirm? Its been 1 and half day by now he's missing. It rained quite heavy yesterday and he still didn't come home.