look almost the same as my freshwater ones, except yours have a gray white look hehe
they should be hatch with in a month. (how many adult one u got, there should be more eggs in other place, they lay eggs like crazy when they feel like to, mine within a week laid all over the glass, plant, heater and even in my HOB filter, now from 8snails~ they turn out to around 200 LOL)
they look like turbo to me, but just so white OoO
and u said they have snout like an elephant, I will guess they r some kind of nassarius snails. (Not pro on Iden different species)
as long as your tank don't have predators, and the paraM r good, the they should be hatch soon and you tank will have million of them LOL~ (my snail tank have algae bloom, they r doing fine, but they lay less eggs than they used to.)
good luck!!
p.s. baby snails IME on the FW ones, after they hatch, most of them like to climb all the way up to the surface. keep your eyes on them, if they r out too long, they will get too dry and die, either put it down, add a little bit water, or spray water on them XD.
and if u have a HOB filter, careful they get into it....my HOB is full with snails LOL