Wikidata dumps are done weekly usually we can expect the "all" ttl dumps to appear in a folder dated on mondays, lexemes ttl dumps used to be on saturdays but they recently moved to sundays.
When consuming dumps it's easier to expect specific a week-day for the data to arrive, should the folder of the various wikidata dumps be set to the schedule time? Currently it seems that the truthy and lexeme dumps are set to time they're launched which depends on the time taken by the "all" dump.