Irrespective of not knowing whether it is standard, HPPR or PPR format, and what kind of 2nd round pick (late/mid/early) I wouldn’t do this trade.
Conner still has value as a RB, is only 25 years old and one who proved that he can be a solid 3-down-back at least and plays in a good offense.
WR landscape is wide, you aren’t really locked at RB. Hardman had one game with 6 and one with 9 targets this season, the other games he saw 4 at best (and that’s while Watkins was hurt almost all of the games) he isn’t even the clear-cut #3 passcatcher, behind Hill and Kelce it’s a lottery every week even if he plays with the best QB in the game. He will have some boom-performances, but you can’t rely on those and there will be even more bust-games for him