Looks good - nice & healthy looking certainly! I can't really see many yellow tips so i'd say dont worry too much. If anything the leaf tips look droopy like they're maybe being overwatered & ur soil looks quite moist too. (could be camera pic tricking me tho). Hence my one tip is just don't water too much - they generally prefer to be underwatered rather than overwatered, plus problems associated with undewatering (drooping plant basically!) are far easier to sort out than if u get problems thru overwatering! (root rot, fungal infestations, etc)
I'd say another week or 2 in that pot would be fine (as it'll help build a nice, fat rootball) but certainly no more than that & it will defo need to be in a bigger pot at least a week before u intend on switching to 12/12.