While most of the small signs are in place it looks like there's still substantial work to be done at I-22 as of tonight: no overhead signs or advance BGSes are in place, the mainline striping is incomplete, etc.
Nothing that couldn't be knocked out in a few days (unless the posts for BGSes still need to be installed, since it'll take longer to cure the concrete - it was too dark to tell) but since it's likely MDOT told them not to do any work that might disrupt traffic Thanksgiving week I doubt it will open by the end of the month unless they plan to post some temporary signs.
Just to follow up, as of Sunday morning the process of installing BGSes was apparently interrupted by the holiday; a crane and a trailer with signs on it was parked on the I-269 eastbound C/D road over I-22. None of the guide signs seemed to be in place yet east/north of there, including the MS 309 interchange, but some of the overhead signs were in place west of the interchange already. The posts on the mainline I-22 for overhead signs were in place but the cross-beams and signs themselves weren't installed yet either. At MS 302 the striping wasn't yet in place either, so I guess the paint crew hadn't made it that far yet.
As far as timing is concerned, I don't know what MDOT's policy on flashing signals before they're activated is, but all of the new signals I saw (MS 302 at the northbound ramp, MS 309 at both ramps) were still covered and not in flash mode.