If I click " join party in progress " is that an absolute that it will ?

[SeekerScorpio]

Or does it take whatever is first ?

Sometimes I am itching to get into any dungeon and want to know if join party in progress would get me in faster ?

if you choose that option, when it pops, right in the middle it'll say in Gold Progress X/X . If it doesn't it's a fresh dungeon.