His mom should pay for Ozempic and a personal trainer!
I don't know about that being standard operation procedure in NYC but it's very common in Jewish weddings all over the world.
At Jewish weddings, giving money in an envelope is a traditional and highly appreciated gift, often preferred over physical presents. Cash or checks are typically given in multiples of $18 (representing Chai or "life"), such as $36, $54, $108, or $180, symbolizing good luck for the couple.
Israel Center of Judaica +2
Key Considerations for Wedding Envelopes:
The "Chai" Rule: Multiples of 18 are standard in Jewish culture, as the Hebrew word Chai (life) corresponds to the number 18.
Amounts: While $130–$180 per person is common in some areas, the amount should reflect your comfort level and closeness to the couple.