DxO PureRAW plug-in has finished processing , but Lightroom Classic CC only shows the processed images with delay, is that normal, why?

This information applies to version(s): 2, 3

There is a delay as Lightroom Classic CC needs to import the resulting images. If you have a big catalog, it might take a few seconds for the first file when Adobe Lightroom is going to re-import the optimized files. However, the next files will follow without further delay.