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This is quite normal. If order is not placed on pre order opening day(at most within a couple of hours), waiting for quite a long period is common.
 
Happens every year, macrumors even posts an article when delivery times begins to slip.

How is it even possible you don’t know this
 
Is there a tracker to see inventory? I know of this one http://iphonechecker.herokuapp.com/ but it only shows apple store inventory, and I don’t know if it’s even reliable. I’m looking for a 13 pro max on tmobile. 128gb, any color except gold.
You would have to go in stores to find out, I know for bestbuy ours won't show up online since we still have preorders we have to fill but you may just hit the jack pot if you go in at the right time, what you have going for you is the 128GB as that is the least demanded storage option so you have a good chance of finding one.
 
How is it even possible they launch and instantly go this far back on delivery dates?
Hey, dunno if you’re aware of this, but we’ve had this little thing called a “Global Pandemic” for the last 18+ months.
 
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