Library should indicate download time remaining

[Popolechien]

It would always be approximate but this would be a small QoL improvement.

[i-am-space]

@Popolechien Implemented this and made a pull request, kindly review.

[i-am-space]

@kelson42 , decomposed the PR into separate commits and made a new pull request to address the issue. Apologies for the inconvenience.