Walt earned 74 million dollars with the methylamine.
In Felina, Walt theorizes that Jack's crew is running out of methylamine.
So by this time, how much money would Jack have earned with the cooking?
Walt estimated that the methylamine, once cooked, would be worth $300 million.
His deal with Declan was a 65/35 split.
At the time of his "retirement" he had about 80 million in the storage unit. 80 million is 65% of 123 million.
There were some other expenses. I assume the payments to the pest control company came out of Walt's 65%. Walt gave $5 million to Jesse.
Overall let's say Walt had cooked about half the methylamine. Jack's gang could thus cook the other half and make as much as $150 million.