... well ... strictly speaking you can apply for *FLR straightaway as soon as you're actually married. Indeed, you must apply for *it within 6 months of the ceremony - since you are already in the UK ... and, presumably, hold a Fiancee Visa. But as you aren't allowed to work until after the wedding has taken place, it would be in both your interests if your partner were to obtain paid employment before that time.
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Bear in mind, too ... that - even then - YOU, yourself, are NOT entitled to claim benefits of ANY kindwithout [I think] first becoming a naturalised British Citizen ... which requires a minimum stay of 3 years in the UK prior to eligibility.