https://www.techpowerup.com/301314/tsmcs-morris-chang-says-arizona-fab-will-produce-3-nm-chips-in-the-future
 
Although Morris Chang is no longer in charge of the day to day business at TSMC, the founder of the company is still getting his hands dirty. Chang attended the APEC Economic Leaders Meeting last week, as part of Taiwan's delegation and was questioned by the media about TSMC's future plans. The specific question was about TSMC's Arizona fab, which will initially produce chips using a 5 nm node. The US$12 billion plant is scheduled to kick off production at some point in 2024, by which time the 5 nm node should be a commonly used node rather than close to cutting edge.

When questioned about the future of the Arizona fab, Morris Chang answered that it will be moving to a 3 nm node, which is currently TSMC's most cutting edge node, that has gone into volume production earlier this year with th N3 node, which is set to be followed by the N3E node. According to Chang, there's interest by several countries to have TSMC set up fabs there, but apparently this is not something TSMC is considering at the moment. One potential reason for this would be a suitable labour force, something that has already proven to be tough for the Arizona fab.
 
With another fab hopefully worldwide shortages will be cut down in my personal opinion. 

If they use it on the 5090 that GPU should be an easy 4k

TSMC is going along at 3nm while Samsung can only manage 20 percent yields. To have a 2nd fab should resolve supply chip issues.