That is Shrimad Dagdusheth Ganesh Installation which is the most popular one during the festival every year. You can see sparse crowds this year due to the incessant rains that we have been having. Here is a report after the fifty day of the festival.
Mumbai always a bigger city with much bigger installations and immersion processions has fared worse.
For instance, the Lalbagh Raja has been drawing much less crowds and people who would have waited for hours earlier can now have darshan by just walking in.