I've been flying in and out of MSP a lot recently. Got to MSP at about 5:15pm this past Thursday, and no line at all at the north precheck. A colleague who wasn't precheck was flying paid F on AA and made it thru security and to his gate (same concourse as UA) in 10 minutes. You should be fine arriving by 5pm on a Monday. Ask to be dropped at departures door 1 (not at the UA door). The new north security is just inside that door.