Display information about an org.
Display information about your default org
Using following command to get your org details like access token, client Id, connected status, org ID, instance URL, username, and alias.
sf org display
Source:
https://developer.salesforce.com/docs/atlas.en-us.sfdx_cli_reference.meta/sfdx_cli_reference/cli_reference_org_commands_unified.htm#cli_reference_org_display_unified