Usually when the Art is at 100% it tends go fast which means that we only have to wait for a few more months
That may be the case for some developers, and DC for some updates in the past - however, art was at 98% since before 20 Jan 2022 (yes, over a year) - while during the same time coding has moved 19% (from 43% to 62%) and posing 38% (from 41% to 79%). As has been stated dozens (a hundred or more?) times in this thread during the tech update, art is not the bottleneck for the tech update; it's been almost completely done for a long time with only small bits left here and there. It's the posing of the thousands of art (body parts that are overlaid to make the scenes on the backgrounds) into the new 16:9 layout and the revision of 6 years of coding that is the most work for this update.
I would not necessarily take 100% art done for the tech update to be as determinative as other updates.
Months ago, DC already started art work for other updates that come after the tech update. But again, the scriptwriting, coding, and posing would still need to be done (and then updating some art to reflect the script, etc). So, those will still take some time.
Over 2 years ago, DC had his supporters vote for which should be done first - the tech update or R(h)onda's update - and the supporters overwhelmingly voted for the tech update. Yes, he thought it wouldn't take very long - but he was wrong.
Finally, there are over 700 pages (14,000 posts) over the past two years discussing and arguing why and whether the tech update was necessary, needed to be this long, etc - from which my post is attempting to summarize into this single post. I might overgeneralize or oversimplify in doing so - but hopefully this gives you a better understanding from where it's come and where it stands today.