Advice on how I can snag last second tickets with these limitations?

I am hoping the canny denizens of this board will have some insights on the best way to accomplish my goal of attending at least a couple of Broadway shows while I'm in Brooklyn later this week at an event with an unpredictable schedule.  On Thursday and Friday, I may or may not have my evenings free, but I won't know until late in the day each day.  Since I don't know, I can't take the chance of buying tickets until maybe an hour, maybe less, before a show.  I know about how long it takes to get from downtown Brooklyn to a theater.  My question is would it be better to first go to TKTS in Brooklyn, assuming it is still open, and see what they have, or go straight to the theater of a show I would like to see and hope they have something available?

FYI, the two shows I'd most like to see are Gary and Burn This.  The latter has decent availability on Thursday but not so much on Friday.  I can see one of these shows on Saturday with much less uncertainty about my schedule, but I don't want to pay regular price for either show if I can avoid it.

This is all new to me -- I usually buy my tickets months in advance!  

there is a TKTS app that you can look at as you're traveling from Brooklyn to Times Square to get an idea of what they have available and at what discount for that night.

There's also the TodayTix app where you can purchase directly from your phone and pick your tickets up from a TodayTix rep in front of the theatre. 

I could be wrong but I don't think there's TKTS in Brooklyn anymore. Didn't it close recently? 

theaterdrew said: "Thanks to all who responded. I figured TKTS in TImes Square would be busier thanBrooklyn's and with my tight time-frame, might not work as well. I hadn't thought about using the app that way, so that was helpful.

I can't do rush per se as I will be unable to go to the box office until almost curtain's up. But, I get the broader point."

You can see what's available on TKTS using the app or online. You don't need to actually be there to see what's available. Also, there is pretty much no line closer to curtain, so you should be able to get a ticket and get to the theater in time. And depending on the show, the later you get there, the increased probability of getting a better seat, since the remaining unsold seats will be made available to TKTS.

I agree with Fosse76. With my experience with TKTS during the low season 30-45 minutes before a show starts, lines tend to be very short even at the Times Square location. It's only long during the peak/high season of late spring, summer, and holidays.

Good luck!