Here's what I have for the list of Season 48 pre-emptions/repeats/episode moves:
9/26 - Pre-Empted - House Intelligence Committee "Whistleblower" hearing; moved to 12/6
11/13 - Pre-Empted - House Intelligence Committee Impeachment hearing; moved to 11/18
11/15 - Pre-Empted - House Intelligence Committee Impeachment hearing; moved to 11/22
11/18-22 was originally intended to be TPIR/LMAD Mash-Up Week, but because of the pre-emptions, it was moved to 3/23-27
11/18 - new episode, moved from 11/13
11/19 - Pre-Empted - House Intelligence Committee Impeachment hearing; moved to 3/24
11/20 - Pre-Empted - House Intelligence Committee Impeachment hearing; moved to 3/25
11/21 - Pre-Empted - House Intelligence Committee Impeachment hearing; moved to 3/26
11/22 - new episode, moved from 11/15
11/28 - Pre-Empted - Thanksgiving
11/29 - Repeat - Black Friday
(in case anyone is wondering why this would be a repeat, my best guess is, CBS's college football game coverage overlaps the Pacific and Mountain time slots)
12/3 - new episode, moved from 12/27
12/4 - Repeat - Cyber Monday Week; may have been pre-empted for House Judiciary Committee Impeachment hearing
12/5 - new episode, moved from 12/30
12/6 - new episode, moved from 9/26
12/9 - Pre-Empted - House Judiciary Committee Impeachment hearing; moved to 3/17
12/25 - Repeat - Christmas
12/27 - new episode, moved from 1/30
12/30 - new episode, moved from 1/29
1/1 - Repeat - New Year's Day
1/29 - new episode, moved from 6/29
1/30 - new episode, moved from 6/30
2/3 - Pre-Empted - Senate Impeachment Trial; no new air date yet
3/17 - new episode, moved from 12/9, then from 7/6
3/18 - Repeat - NCAA Basketball Tournament week
3/19 - Repeat - NCAA Basketball Tournament week
3/20 - Repeat - NCAA Basketball Tournament week
3/23-27 was TPIR/LMAD Mash-Up Week, moved from 11/18-22
4/3 - new episode, switched with 5/29
4/24 - Repeat of 2019 Kids Week College show - the 2020 episode was not taped
5/8 - TBA - this was supposed to be a Mother's Day (Baby Shower?) episode, but it was not taped
5/29 - new episode, switched with 4/3
The last scheduled new episode is 6/1, although the 2/3 episode has not aired yet (assuming it does not air on 5/8)
There was also a July 4 episode scheduled for 7/3, but it was never taped