Yes, the delisting date is after the market close on April 12th, at which point SGG & those other ETNs that they are replacing will trade on the OTC market. You would want to sell before then as trading on the OTC market, especially considering most of the shares will have been redeemed by then, will likely be very thin, with large spreads.
If I were long SGG, I would sell it sooner than later & just take those funds & buy CANE or SGGB (which will likely start to see more & more volume as time goes on, thereby reducing the spreads).

I can’t recall any similar instance where an ETF or ETN company decided to replace a bunch of their ETP’s with other similar ETPs, delisted the originals but I would assume that going forward, even before the delisting date, liquidity is likely to dry up in SGG since they aren’t allowing any more purchases, only closing transactions, at least through the broker that I tried to buy it with yesterday.

The delisting date is April 12th EOD. What’s the “normal” historical behavior of securities before delisting (if there is a normal one)? If I am already in SGG, should I get out ASAP or is it safe to stay in for another 2 weeks? Do prices continue tracking the commodity properly or do the normally stop responding to reason? I just never had that experience, so looking for any advice.

SGG is scheduled to be delisted by iPath soon & has already been replaced by the ETN provider with SGGB (similar to the recent JJG official trade that has been replaced with JJGB). As SGGB is still thinly traded with significant spreads between the bid & ask price, I will use CANE as the proxy for this trade. A new post with a chart of CANE along with the trade parameters will be posted tomorrow. As the market is now closed, it would only be prudent to wait & see how CANE is trading after the opening bell before taking a position so trade parameters on CANE will be posted tomorrow after the market open.

SGG may be in the process of being replaced by another sugar ETN with a different ticker, possibly SGAR (also through iPath ETNs). More info to follow asap.