When to pump?

FTM/SAHM/EBF

I’m going to a funeral this Sunday for a couple of hours and my mom will be watching my 12 week old son. My son only took a bottle a few times when he was a few weeks old.

My question is when should I pump? I only rotate breast every feed and I feel like my son eats every 2 hours. 😭 I will be giving him the bottle as well so he can get used to it by Sunday hopefully.😪 so I’m going to need lots of breast milk supply.