How to find out when azure snapshot is finished creating

I'm taking a snapshot of a disk on azure. I'm using the Node SDK. When I issue the command to take a snapshot, within a few seconds I get the response back. I'll paste the output below.

The thing is, the provisioning state always shows Succeeded even though the snapshot is obviously not finished being created yet. And it does not yet show in the dashboard.

If I use the snapshot.list method, it also says Succeeded for this snapshot.

How can I query to find out when the snapshot is actually finished being created?

<pre>
{ id:
     '/subscriptions/1a6c4c11-6729-48fb-8e76-06c6281bb6f1/resourceGroups/RGOUP1/providers/Microsoft.Compute/snapshots/snapCostTest',
    name: 'snapCostTest',
    type: 'Microsoft.Compute/snapshots',
    location: 'westus',
    sku: { name: 'Standard_LRS', tier: 'Standard' },
    timeCreated: 2019-08-16T00:51:04.099Z,
    osType: 'Windows',
    hyperVGeneration: 'V1',
    creationData:
     { createOption: 'Copy',
       sourceResourceId:
        '/subscriptions/1a6c4c11-6729-48fb-8e76-06c6281bb6f1/resourceGroups/RGOUP1/providers/Microsoft.Compute/disks/vm1_OsDisk_1_502b5534fe4b4f288d19e127c457d652' },
    diskSizeGB: 127,
    provisioningState: 'Succeeded' } </pre>