I’m pretty sure that Apple doesn’t allow banks to talk about their plans regarding Apple Pay, until the actual release of the feature. So I wouldn’t expect to get any information on Monzo about timescales. By the time they tell us, it will be released. However, I think it’s safe to say they’re aware of the demand and are likely working on it for release as soon as practicable (click the 
to see Matt’s image).
https://community.monzo.com/t/apple-pay-any-updates/2005/92?u=jzw95