If you click on the button, you don’t have any info? If you have access to Portfolios you are on Business. If not but you have Timelines in projects, you are on Premium.
Yes as custom fields at the project level by using portfolios (Business plan)
That would require custom fields and project dashboards/global reporting, not possible in Free. Or you can use a 3rd party tracking app Time tracking in Asana: a community built comparison