How to know whether the physicals (spd/str) are capped or not?

Since you are brand new, here is what it states in Help/FAQ:

"A player needs to reach 100 points in a particular skill to gain a level/point in that skill. Once he gains a level he again starts from 0 plus training points over the 100 from the last level gain.
Each training cycle (once per week) a player gets 10 +- 2 training points automatically, he also gets points from teamwork (teamwork divided by 2), each player also gets gets training points from the coaches skill (For Example: player is training kicking, the coaches skill in kicking is 17 so the player gets additional 17 training points) and lastly he gets 4 additional points for the training hall and 4 for each consecutive training hall upgrade. He also gains/loses points depending on training intensity and players age. And that's the secret of training in Grid-Iron world."

Since you are a new team, you will get 10 pts (+/- 2 pts random) and you will also get the teamwork/2 as additional points. If you have a player with 20 teamwork, you will get anywhere from 22 pts to 18 pts per week. Then you have to select the training for that player. If you use focus on speed for example, you will get 75% of those pts to speed, so you can get anywhere from 17 to 14 pts for speed, so it will take you 6 to 8 weeks without further facilities. Increasing training intensity is not worth it, so please don't try that. Just be patient, get your finances in order and soon enough you can add facilities and coaches