After running the helm upgrade --install command, it can take several minutes before output is returned. It should look a bit like the following:

Release "gitlab" does not exist. Installing it now.
NAME: gitlab
LAST DEPLOYED: Wed Jan 2 12:31:31 2019
NAMESPACE: default
STATUS: DEPLOYED
RESOURCES:
==> v1/PersistentVolumeClaim
NAME STATUS VOLUME CAPACITY ACCESS MODES STORAGECLASS AGE
gitlab-minio Bound pvc-fc207fb5-0e81-11e9-b9ef-025000000001 10Gi RWO hostpath 9s
gitlab-postgresql Bound pvc-fc2158a3-0e81-11e9-b9ef-025000000001 8Gi RWO hostpath 9s
gitlab-prometheus-server Bound pvc-fc2240b5-0e81-11e9-b9ef-025000000001 8Gi RWO hostpath 9s
gitlab-redis Bound pvc-fc236cfb-0e81-11e9-b9ef-025000000001 5Gi RWO hostpath 9s

Afterwards (or during the deployment in another session), you can issue a helm status gitlab command to see info about the deployment.