[Vuejs]-Ag-grid in vue display custom component when loading the rows

I think the attribute is overlayLoadingTemplate in ag-grid instead of loadingOverlayComponent. Kindly visit ag-grid overlays to see how you can add loader to your ag-grid table

You import the TableProgress but you don’t use it. You must add it in components.

<script> 
import TableProgress from "./TableProgress"; 
export default {
    components: { 
        TableProgress
    },
    //... 
}
</script>