If one reads the comments and observes fresh games on the index, the conclusion is, that the typical waiting time is around 7 days to 30+ days. Sometimes longer. This is speculation, but it might vary with staff availabilty and maybe they do things in bulk. So anytime a flu wave strikes or any other thing that might occupy staff attention, the waiting time might rise.
There could be a running average of the indexing time by community comparision. But that waiting time is said to not be first in first out, so the results would be very inaccurate.
While indexing is meant to bring a little bit of quality standard, in my opinion, the most important aspect is trying to catch bad actors. Be it yet another crypto scam, shovelware, spam and of course malware. I have seen a lot of malware here. And, sadly, hacked accounts.