As far as I know LazerZombies has been abandoned, and likely won't ever get finished. Probably because income picked up faster than expected for DeltaZone, and as such, no longer needs the funds from LazerZombies to continue development of DeltaZone.
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Project started out in Jun 2021, at about $700 a month. So if you see in Nov 2021, they were earning $1,800 a month. Then they had a spike, to $4,700 the next month in Dec 2021, and it hasn't dropped below that amount since then. In April 2022, it did drop to $3,300, but that is the lowest its been. If it had stayed at $1,800 a month, its conceivable, they'd need the funds from LazerZombies to keep development going, but as its spiked all the way now to $6,900 (with a highest peak of $9,300 in Feb 2023), its unlikely they need the money from LazerZombies and so any time spent working on it, isn't time spent working on the project making bank.
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As far as development speed goes, 1 year is best case scenario. A more conservative value is 3 to 5 years.
1] There isn't any replayability as zones are exactly the same each time you enter them, with no random placement of containers, enemies, or special events.
2] There are still massive gameplay bugs that have been in the game since Release 13 that have not been fixed. Like how Composite guns are actually worse than Modern guns in almost every way for the player.
3] Enemies still cheat a lot. Yes, there are elements of stealth and proper gameplay for the player, but it isn't always sufficient to prevent their cheating.
4] Enemies aren't bound to the same problems the player is. We have a bionic hand, and yet we have arm fatigue, but enemies with no bionic hand have no arm fatigue. Enemies can fire full auto without jamming, but we can't, not even with a full composite. Enemies have unlimited ammo and can spray/pray, etc etc etc.
5] Enemies have actual armor that actually reduces damage from bullets. We have cloth, that does nothing and it shows. 1 Bullet from a corporate will nearly kill you in full corp gear, but it takes almost an entire clip to the head to kill a corporate.
6] Sex is nonexistent for a porn shooter.
7] The customization of character mentioned in the roadmap, like cyberware upgrades or armored tits or facial reconfiguration or at least face paint, is still not in.
Game has come leaps and bounds from what it was in 2022, but it has a long way to go before I'd call it a game worth playing for longer than 30 minutes.