According to Coinbase Blog post, support for XRP will initially be available for Coinbase Pro users in the US (excluding NY), UK, supported European Union member nations, Canada, Singapore, and Australia. Additional jurisdictions may be added at a later date.
After 10am on February 25, 2019 they will begin accepting inbound transfers of XRP to Coinbase Pro. Deposits will be accepted for a minimum of 12 hours prior to enabling full trading. Once sufficient supply of XRP is established on the platform, trading on the XRP/USD, XRP/EUR, and XRP/BTC order books will start in phases, beginning with post-only mode and proceeding to full trading should our metrics for a healthy market be met.