Take a routine to check daily, and take notes to give them feedback on how to improve and what is going well. Potentially use comments functionality to add comment directly on the map
Especially first days sets the tone, as it is important that the team gets it right and they notice that the mapping and documentation is being used by project manager to ensure quality.
Check progress and gaps. Ensure that the team is mapping all that is being built to ensure mapping and reality matches. Compare also that there are no gaps in the mapping especially compared to plan.
Check build quality from photos portal on daily basis. Typical issues to address are
Check with documentation. If you are unsure the team captures everything correctly it is good practice to do first documentation of the first small area after a week or two to ensure everything is captured well.
Provide feedback to team how they need to improve their mapping and build-out.
Remember that a well-motivated and trained team makes the project manager's job much easier during the project. It is vital that the users know how to use Groundhawk well before starting. Think that to prevent most of the mistakes takes only an hour of training whereas an untrained person mapping and making mistakes can easily generate need to later correct the mistakes that cost and take days of work to fix.