I added this post processing script in Cura to add the estimated time remaining and the layer number, this is incredibly useful. I am using this on my Ender 3.
How to install:
Download the file from -> click here
If you are on Windows go to:
C:\Program Files\Ultimaker Cura \plugins\PostProcessingPlugin\scripts
C:\Program Files\Ultimaker Cura 5.x.x\share\cura\plugins\PostProcessingPlugin\scripts
and drop the file there.
If you're on Mac go to:
right-click on the app and select "Show Package Contents",
then go to:
Next Select: Post Processing
Next Select: Modify G-Code
Click "add script" and select "Display Time and Layer on LCD"
Enable the checkbox
Now it should work, also note that if you do not want the layer number you can simply skip points 1 and 2 and select "Display time remaining on LCD" instead.