Yes, all your already saved and new leads saved in Hunter be automatically imported to the selected service when integrating it with Hunter. You can choose between the following integrations:
To check the synchronization status of your leads, simply go to the Leads section and click on a lead. Scroll down to see if the lead has been successfully added to your CRM (the lead will show the tag "Saved").
Please note that the leads are saved only once: any changes on the lead in Hunter afterward won't be saved to your CRM. Already existing leads in the CRM won't be enriched as a new lead will be created.