What scales should I learn first on piano?
In general, it's a good idea to start with the major scales first, then move on to the natural minor, harmonic minor, and melodic minor scales. Once you master those you can move onto things like chromatic scales, ​blues scales, pentatonic scales and whole tone scales.
How fast should you be able to play piano scales?
Try it now, at various tempos. If you can play at 120, you are in good shape, and can play fast enough to pass the RCM Level 10 exam. At 144, you are probably more comfortable with scales than most college-level piano majors. At 176, you should not have a problem playing scales in all but the most demanding repertoire.