EK are generally reasonably good at speeding pax through the airport to make connections. They won't usually hold flights for late incoming planes though. The next EK flight to MRU isn't until 03.10 the following morning.
Flightstats.com confirm that EK204 has a mean delay of 31mins but that 68% of arrivals are 'on-time' (0-15 min late). 82% of arrivals are within 30 mins of 08:10 so you should be OK.
As an alternative you could take EK206 / EK701 with a 4:15 connection.
I doubt that you will see major changes in flight times.

It might be worth thinking what you might want to do with an unscheduled 17hrs in Dubai beforehand in case you don't make the connection - hopefully you could get EK to provide a hotel and get out of the airport.