I have created Ilmango's cobblestone generator in bedrock edition, I made a few changes because quasi connectivity doesn't exist in bedrock and it produces 11,520 blocks per hour. : r/Minecraft
ilmango - YouTube
How To Make Fully Automatic Cobblestone Farm | Latest 2021 | Minecraft PE | 1.18 - YouTube
Tutorial: Fully Automatic Cobble Farm for 1.11/1.12/1.13 (160k/h) - YouTube