After successfully configuring billing accounts, you will see the cost data in the platform only after the weekly accounts onboarding process completes. Manual onboarding of new accounts is scheduled to run every Wednesday at 8:30 am UTC. If you have added new accounts on Wednesday at 11 am UTC, the related cost data will appear in the platform next Wednesday after the scheduled accounts onboarding process is completed.
GCP BigQuery data should start flowing into any billing accounts configured this week after Wednesday at 8:30am UTC.