Check with your company to find out if the plan will allow you to continue making payments after you leave the company, or whether you are required to repay the balance of your loan before you can roll over the remainder to Wahed Invest.
If you decide to take your money out of the plan and don't repay the loan before doing so, the amount of the unpaid loan is added to your income for the year (which may be taxable) and may also be subject to IRS penalties, depending on your age.