Congrats on your son playing at a level which attracts some scouts.
We are at the part of the season where scouts are scrambling to finish their areas and submit kids names for their club's draft board.
Unless you see cross-checkers (or above [i.e., area scouts' boss]), any draft will be after slot rounds. Now, it's never too late to have a big boss show up for late bloomers, but you'll know based upon hasty home visits - because it's so late.
Here are indications of interest, and how high a kid could go: area scouts, videos sent to mother club, cross-checkers (and above), questionnaires, home visits, requests for bonus numbers, questions to references (coaches, etc.), requests for medical records, requests for urine tests. HS slot potential picks will be able to determine if there is interest (and interest doesn't mean actually being drafted) - and the reason is the huge penalty which happens when a slot pick doesn't sign.
Now, just because a kid isn't slot, doesn't mean he will be offered pennies. I always assume a legit HS pick (i.e., not a relative of an insider) will be offered 100k (plus the MLB scholly). Why 100k? Because that amount carries no penalty to a team. Moreover, the top post-slot picks can be offered whatever slot savings have been achieved (i.e., college senior slot discounts) in addition to the 100k.
Thus, a post-slot kid can get slot type money.
100k for one kid may be cheap; 100k to another may be a fortune. There are many variables for a kid to weigh in deciding to go pro from HS.
You have NO control over whether your son makes the draft threshold; you have control on whether he actually gets drafted (once over that threshold) and signed by offering a bonus number in the club's range. Ask too much and hes not drafted. It's time to sit down and think through what offer would make him sign and forgo college - if you wait til after he's drafted, the circus surrounding the draft and time frame to sign can be too intense to cooly evaluate your options.
PS. Not being drafted has no meaning for the future.