Process type for telegram bot on Node.js. Couldn't find that process type?

Question

Node.js

I started to figure out how to run a script for a bot on heroku.
In Procfile I wrote worker:node index.js.
On the command line, I type heroku ps:scale worker=1 and it prints out Couldn't find that process type.
Correct me please.
PS I made a bot following the example of this p