How to get rasa training time callback

Hello. I have a script that uses rasa trainer from “rasa.nlu.model.Trainer” to train rasa model. This script is called using a REST-API. When the user calls this api, the model starts training, but I want to give the user a estimation about the training time or show the progress bar percentage for him/her. How can I get this training duration or any callback about the training progress? any idea?

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