What I don’t know is having been injected, whether the extra marinating time be beneficial or detrimental. They sell pre-marinated meats in cryovac bags at the grocery store, so it seems like it would be OK.
Beef in Cryovac are actually wet aging when you buy them. The sell by dates can be misleading an in an abundance of caution. Many meats, even poultry are still good quite a while after the sell by dates.
I’m one of those that doesn’t think freezing is too damaging to meat. I freeze almost everything and still get restaurant quality and better rare boneless strip steaks off my grill. When cooking the stuffing out of something like we do with brisket I think it’s even less of a worry.
BUT…I’m also not freaky about meat in the fridge a little long in the tooth, especially if it is being smoked for a long time eventually.
My guess is you are probably good either way. Freezing may be the safer bet but wrapped in the fridge is probably OK for the six days. It may even be better.
Even if you had a food saver, you would need the big bags at least. I suppose its way too big for a gallon Ziploc? That is an alternative, squeezing all the air out, if it fits.
I also assume the reason you want to wait till Saturday is you work during the week. I also suppose you know you don’t have a game next Saturday?