Are the store s in the mall are open at the same time

All stores open at 10 am with the exception of some food court locations that serve coffee and breakfast items.. Mall walker access begins at 8 am.

No some open a bit later than others and close earlier. Not by much though.

yes

Some malls open at one hour early differential then others. But some malls have more attractive for example: a place to relax charge your phone and news to watch. And place for kids to roam.