Here's an article from last year showing draft pick success rate:
https://www.tsn.ca/statistically-speaking-nhl-draft-pick-value-1.786131
From 1990-2013 the chances of drafting a top 6 forward/top 4 defenceman/number 1 goalie in the 2nd round was not much higher than 10%. We will be very lucky to get one good player out of the four 2nds. Third liners or third pairing D would also be good picks though.
Scanning random draft years in hockeydb you typically find 3-4 good NHLers in the 2nd round. It's up to the scouts to find these guys. Timmins needs to get it done this year.