Emerald and Ruby - do I have a chance?

[Jarvio]

My Cloud is on level 88.
My Cid is on level 83.
My Yuffie is on level 83.
My Red XIII is on level 79.
My Tifa is on level 78.
My Barret is on level 77.
My Vincent is on level 76.
My Cait Sith is on level 74.

I have every possible limit break and every character's ultimate weapon.

I have every possible summon.

I have mime. I have counter.

HOWEVER....

I do not have final attack materia.
I do not have W-Summon.

Therefore, do I have a chance of beating emerald and ruby without these two things, at the stage I'm at now? Or would you advise I got these things first?

Thanks in advance.