Here is my fully automatic sugar cane farm. It uses an RFtools sensor to tell when the sugar cane is 3 blocks tall, then it pushes the blocks out behind the sugar
How to Make a Sugar Cane Farm in Minecraft (2022) | Beebom
Here's how to build an automatic sugarcane farm in Minecraft - WIN.gg
Sugar Rush! How to Make an Automatic Sugarcane Farm in Minecraft « Minecraft :: WonderHowTo
Sugar Rush! How to Make an Automatic Sugarcane Farm in Minecraft « Minecraft :: WonderHowTo