5 000 000 - 597 000 /mined already/=4 403 000 blocks remaining
5760 blocks/day
4 403 000/5760=764 days=25+ months
It is likely that average block time is less than 15s so we can expect in about 24 months for the block 5M to be mined from now on. Then there will be 3 billions of coins mined.

After that there will be 32% reduce of the coins per block which is 408 coins/block.
It will take approx another 24-25 months for the next 2 040 000 000 coins to be mined.

Next stage another 32% reduction of the reward which leads to 277.44 coins/block.
It will take approx another 24-25 months for the next 1 387 200 000 coins to be mined.

For the final stage there will be 72 800 000 coins left which will take 67 days.