I am on compny visa for 90 days stay So can leave...

In the event that you have a residence visa with a validity of three months and you want to leave for the place of residence and obtain an exit and return visa, the visa fee is approximately 200 Saudi riyals, and if it is related to a final exit visa, it is exempt from any fee. It is possible to leave and get the passport stamped without any obstacles

Dear, if the work is during the probationary period, then this period is specified in the work system and the text of Article (53) as amended from it
If the worker is subject to a probationary period, this must be expressly stipulated in the work contract, and clearly defined, so that it does not exceed ninety days. It is permissible, by a written agreement between the worker and the employer, to extend the probation period, provided that it does not exceed one hundred and eighty days. The trial period is the holiday of Eid al-Fitr and Eid al-Adha and sick leave, and each of the parties has the right to terminate the contract during this period unless the contract includes a text that gives the right to terminate the contract for one of them.