This is a paid asset, but now you can download Bakery Real-Time Preview Free.
Detail this asset from Unity Store: Original Link
Bakery Real-Time Preview v1.18 (Latest version)
Bakery Real-Time Preview v1.0
Requires Bakery v1.71 or higher.
RTPreview is a real-time ray tracing plugin for Bakery Lightmapper that makes it possible to quickly visualize and tweak lighting for future lightmaps before baking them. RTPreview is not a production renderer, but a “how lightmapper sees your scene” kind of view. What you will see is what every traced ray sees in Bakery, meaning its main purpose is fine-tuning lighting and making sure your geometry and materials are properly represented. Similar to Bakery itself, RTPreview can take advantage of RTX hardware to render faster.
* Requires Bakery Lightmapper
* Documentation. make sure to read about functions and limitations