Loading level async and execute code during laod

Hello unity gurus. I have a question in regards to loading my scene using LoadLevelAsync. When i implement it, that works fine, it loads my asses etc no problem with a working progress bar.

However my question is that upon scene start, i have a lot of code that is executed (generating terrain chunks) that takes about 5 seconds. Is there a way to add a tag to the scene that loading is complete after certain code loops have been executed (initial chunks finished generating)?

best regards