Can we track OS Deployment on the computer initiated by BigFix Bare Metal imaging?

Usage and Config OSD
4

I think that you should be able to retrieve these info via Rest API.

The following one should help you:
https://< bigfix_ip >:52311/api/dashboardvariable/OSD_DataStore.ojo/OSD_Server_Hst_< ActivityID >

ie:
https://XX.XX.XX.XX:52311/api/dashboardvariable/OSD_DataStore.ojo/OSD_Server_Hst_178349461
to get the info of the activity id 178349461

Activity dashboard reads data from datastore variables.

hope this helps