Q: How do I know if the migration assistant is actually working? I got as far as a screen that says it is "Transferring your information" and there is what looks like a progress bar but that has moving blue diagonal lines rather than any progress

The fan on my target computer is whirring away and so it sounds like something is happening. But there doesnt seem to be any way of telling from either the traget or the source computer if the thing is actually working.  How many hours should I wait before concluding that something has gone wrong?  I have over 100GB of data so I am not expecting it to be fast! 

Is it normal for the source computer to just drop out of migration asssistant at the begining, or should there be some sort of indication that it is working?  What about if I use activity monitor is there any clues I should be looking for there?