This is just a simple script for Covid-19 to check if there are any delivery timeslots based on your postal code.

pyDeliveryTimeslots.py

import os, sys, re
import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

def _log(szString):
    print(szString)

def main(PostalCode):
    '''
    Fairprice
    HTTP GET - https://website-api.omni.fairprice.com.sg/api/slot-availability?address%5Baddress%5D=&address%5Blatitude%5D=1.39461688537769&address%5Blongitude%5D=103.745768782105&address%5Bpincode%5D=<Insert_Your_Postal_Code>&storeId=165
    
    Giant
    HTTP POST - https://giant.sg/checkout/cart/checkdelivery
    Data to send is postal_code=<Insert_Your_Postal_Code>
    
    Cold Storage
    https://coldstorage.com.sg/checkout/cart/checkdelivery
    Data to send is postal_code=<Insert_Your_Postal_Code>
    
    Sheng Siong 
    HTTP POST - https://www.allforyou.sg/Common/pinCodeSearch
    Data to send is code=<Insert_Your_Postal_Code>
    
    You can try adding Redmart to the list
    https://redmart-delivery-schedule.lazada.sg/schedule?hybrid=1
    '''
    FP_URL = "https://website-api.omni.fairprice.com.sg/api/slot-availability?address%5Baddress%5D=&address%5Blatitude%5D=1.39461688537769&address%5Blongitude%5D=103.745768782105&address%5Bpincode%5D=" + PostalCode + "&storeId=165"
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:59.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36'
    }
    resp = requests.get(FP_URL, allow_redirects=True, verify=False, headers=headers)
    szContents = resp.content.decode('utf-8')
    matchObj = re.search(r'available\":(.*?)\}\}', szContents, re.DOTALL|re.UNICODE)
    if matchObj:
        if matchObj[1] == "false":
            _log("[-] No delivery slots from Fairprice.com")
        else:
            _log("[+] Data from Fairprice.com : %s" % (matchObj[1]))
    G_URL = "https://giant.sg/checkout/cart/checkdelivery"
    data = {"postal_code": PostalCode}
    resp = requests.post(G_URL, data=data, allow_redirects=True, verify=False, headers=headers)
    szContents = resp.text
    matchObj = re.search(r'earliest\"\:\[(.*?)\]\}', szContents, re.DOTALL|re.UNICODE)
    if matchObj[1]=='':
        _log("[-] No delivery slots from Giant.sg")
    else:
        _log("[+] Awesome, there are time slots : %s" % (matchObj[1]))
    
    CS_URL = "https://coldstorage.com.sg/checkout/cart/checkdelivery"
    data = {"postal_code": PostalCode}
    resp = requests.post(CS_URL, data=data, allow_redirects=True, verify=False, headers=headers)
    szContents = resp.text
    matchObj = re.search(r'earliest\"\:\[(.*?)\]\}', szContents, re.DOTALL|re.UNICODE)
    if matchObj[1]=='':
        _log("[-] No delivery slots from Coldstorage.com.sg")
    else:
        _log("[+] Awesome, there are time slots : %s" % (matchObj[1]))
    
    SS_URL = "https://www.allforyou.sg/Common/pinCodeSearch"
    data = {"code": PostalCode, "pinStatus":1}
    resp = requests.post(SS_URL, json=data, allow_redirects=True, verify=False, headers=headers)
    szContents = resp.text
    matchObj = re.search(r'response\"\:\"(.*?)"\}', szContents, re.DOTALL|re.UNICODE)
    if matchObj[1]=='Failed':
        _log("[-] No delivery slots from Sheng Siong (allforyou.sg)")
    else:
        _log("[+] Awesome, there are time slots : %s" % (matchObj[1]))

if __name__ == '__main__':
    if (len(sys.argv) < 2):
        _log("[+] Usage: %s [Postal_Code]" % sys.argv[0])
        sys.exit(0)
    else:
        PostalCode = sys.argv[1]
        _log("[+] Searching for timeslots for your postal code : %s" % (PostalCode))
        main(PostalCode)