Just to interject here. For those wondering the actual thing holding up the lander and liftoff lunar vehicle is a really sore spot. Because what’s stopping us isn’t some technical challenge.
SpaceX owned by Elon Musk and Blue Origin owned by Jeff Bezos are having a spat over who gets to build the HLS. And the objecting and complaining to courts that NASA isn’t being fair to (insert either of these players) has easily set back going back to the moon at least half a decade if not moreso.
So this pretty specific part of the whole moon landing has actually held up a lot surprisingly but mostly because we’ve got two very rich people having a very visible cat fight that’s slowing everything else related to moon travel down to a crawl.