I would expect the late round draft picks to sign their deals relatively quickly. It will most likely take a little while longer for the top picks to sign, as they wait for other top picks to set the market value.
Here's the write-up I made in my post-draft analysis of Smith:
Round 7 (219) - LB Kelvin Smith, Syracuse
Although Smith played ILB in college, he'll most likely be used at OLB in Miami. He tackles well and can rush the passer with some success, but he doesn't have much of a burst and probably isn't a big playmaker. He will have trouble in pass coverage as well.
Expectations: Despite Smith's weaknesses, he will be able to make an impact on special teams for Miami. With his versatility at LB, he'll make for a good backup. He has a lot of experience coming out of college and that will help him transition.