If they're that far into flowering this early and they're not autos your best option is to use light deprivation ASAP and continue flowering them until they're done. Too far along to reveg and grow this summer. You want to start depriving them of light so they only get 12 hours as soon as possible before they start to reveg.
If you try and reveg the growth is going to come out of what's already flowering and that will turn nasty and be unsmokable. The plants may also not do much for a while and end up with dismal flowering and not finish with decent results.
If you planted more seeds now you'd end up with bigger plants that will flower as the day length gets shorter.