Dr. 18 Jan 5, 2025
some of the file names in the music files from Astro's Playroom have dates in them that can probably determine when they were finalized, for example:
SSD Speedway is 20200331_SSD_Space_Centre_MAIN_QUAD_v4_112BPM,
GPU Jungle is GPU_Jungle_v21_MAIN_QUAD_126BPM_20200501_cut680ms
Show threadDr. 18 
Astro Bot has more of this, with leftover dates ranging from 2022 to mid 2024, some examples:
Intro Cutscene, INTRO_V1_START_QUAD_20240115
The Satellite, INTRO_V1_SATELLITE_GAMEPLAY_MAIN_QUAD_20240115
the one 2022 date i found was in Pirate_Mini_Boss_v2_END_STINGER_QUAD_160BPM_20221207
Jan 3 at 11:30pmWeb