Congratulations! 6lb 11 is a really excellent weight, so that's great. You will hopefully be home quite quickly.
When DD was in NICU one of the nurses told me that babies sometimes 'go on holiday' (her phrase) at 35 weeks, especially boys apparently. What she meant is that they can seem like they are sleepy and not making any progress for several days but then boom, everything then progresses very quickly.
Wrt expressing, it's best to stick to hand expressing directly into syringes while you are still producing the thicker yellow colostrum - only switch to pumping once it starts getting thinner and whiter and more copious ie turning into milk. They only need tiny amounts of colostrum and it's normal for colostrum to be produced in very small amounts, so don't be discouraged. If expressing at home it can help if you look at pics of your baby or just think about him. If it looks like you'll be expressing at home for a while (hopefully not but depends how he does with latching) then look into hiring a hospital grade pump to use at home, they are much more effective and not expensive to hire.
I found it hard and slow to establish BF with DD, which is why she was in for 3 weeks (born at 34 weeks). At the time I thought it was because of all the tube feeds she was having but much later found out she was tongue tied. Lots of people do find BF a preemie very hard, some choose to switch to bottles of EBM to get them home sooner and then try to switch to BF once home.
Going home without them is hard - having said that I stayed in with Dd for the first 10 days and it sent me a bit loopy, so actually going home and keeping busy with your DD will help keep you sane. You can leave something that smells of you in DS's cot.
I remember SCBU as a real rollercoaster, it felt like DD would make progress and then go back again. I was so desperate to get her home that every setback was a real blow. Also all the medical jargon scared the hell out of me (I am terrible for googling things and scaring myself). So with hindsight I should have adopted more of a "one day at a time" mentality.
Best of luck. SCBU is stressful but thankfully for "late prems" like yours it is generally over very quickly.