To be eligible for bonus shares, you must purchase the stock on or before the day before the ex-date/record date. After the ex-date/record date, it usually takes around T+2 days for bonus shares to be credited to your demat account, but the timing may depend on the RTA.
CDSL will send you an SMS once your bonus shares have been credited to your account. However, your shares will initially be credited under a temporary ISIN and won't be immediately available for trading. Approval for trading can take up to 4-5 days, after which your bonus shares will show up on Kite.
Until your bonus shares are credited, the P&L in Kite/Console will show an artificial drop.
If it has been more than 3 days from the ex-date/record date and your shares still haven't been credited, you can create a ticket.