How to have ExecuteTime in Jupyter cells

jupyter_nbextension_installation

1- Install jupyter and its extensions:
$ conda install -c conda-forge jupyter
$ conda install -c conda-forge jupyter_contrib_nbextensions

2- Should be installed on every conda environment
3- Not sure about the install command below, maybe
4- should only be done for the base environment or
5- not be done at all:
$ jupyter contrib nbextension install --user

6- Start jupyter:
$ jupyter notebook

7- Go to Nbextensions
8- Uncheck: disable configuration for nbextension...
9- Check: ExecuteTime