The worst moment to ask is when the customer is clearly in a rush, when something has gone slightly wrong and you're recovering, or when the customer hasn't really engaged and you're asking cold. Timing it to a genuine positive moment makes the ask feel natural rather than transactional.

Brief your staff on this. It doesn't need to be a big training session — just let them know that when a customer says something positive, it's fine to mention the Google reviews. Most staff feel awkward about asking because they haven't been explicitly told it's okay. Once they know it is, and they have the right words, it becomes second nature.