Deploy Flask app for telegram bot on Heroku

I have proceeded along the video till 'git commit -m “initial commit”, after that I have installed heroku CLI, but while in the project folder(within virtual enviroment) my command prompt gave me output as

‘heroku’ is not recognized as an internal or external command,
operable program or batch file.

git is working fine but can’t be able to deal with heroku. Do we need to install Heroku in some particular folder for it to work properly?
Can somebody help me with this.

I have found the mistake. Thanks anyway!!
By the way, I think there is a mistake in setting up Procfile in our directory.
The command inside should be “web: gunicorn app:app”. there isn’t a colon after web in the video.