Every day delayed is skirting toward loss of your vote. The internal delay inside the network might mean more days delay than you think, especially toward a weekend. Don't second guess whether you can get a postmark at your local post office. Don't bother trying to figure out where in the fringe of the consolidated network you are and how much delay that will cause. Most people don't even know the farther away you are from a point of consolidation, the harder it is. Mail needing corrections are sent even farther away, possibly out of state. The national mail service may still be beset by listing schemes against voters, especially this fall, even if NYS is against them.
Mail as early as possible and track as possible. Prepare your mailing carefully. Don't forget the exterior envelope. Have a contingency plan to vote in person, use drop box, whatever. Stay on it. Every election. In the crush a lot of mail including ballots bypasses the cancellation machine with only a light "red tag" barcode on the back to identify it or maybe just in the manual leftovers. A lot of manual or timed out mail piles up at the end of the night necessitating culling for ballots and postmarking- but during primaries? Unlikely. A small percentage granted, but all made more possible with the new system. Plus we get a small number of ballots going to and fro from literally everywhere not getting special treatment. Don't even risk being in that small number of fatally delayed ballots..