I have inherited and added a date fields in the sales form and delivery form. I need to update the date in the delivery form as I update it in the sales order form by confirming it. How can I do this in odoo 15.

from odoo import api, fields, models, _, exceptions
from datetime import date, datetime


class SaleInheritance(models.Model):
    _inherit = "sale.order"
    real_date = fields.Date(string='Real date')


class StockPicking(models.Model):
    _inherit = "stock.picking"
    real_date = fields.Date(string='Real_date')

here is my python code