moving from http to https question

[optionsmegastore]

hi everyone, i would be really thankful if any can help answering some questions regarding my topic.

i'll make the long story short. i have a website which have always been http, and i have google sitemap module in prestashop back office,and submitted my sitemap to google sitemaps as well.

now i moved to https, and submitted my https url sitemap to google sitemaps. while i still have the http sitemap in google sitemaps.

but as for my backoffice the sitemap cant add an https, it has to be reset totally in order to add https.

the question is,

1-should i delete my http url from google sitemaps?

2- should i reset the module to make it to https instead of http?

while my rank in google have always been great, i am afraid if i deleted any ( back office module or the url from google sitemaps) i would loose my old rankings.

thank you and i really appreciate any help.

  

[ComGrafPL]

Leave http one on google search. Use module to generate new https one.

[optionsmegastore]

even if i will have to delete the module that generates the http before adding the https?

[PrestaHeroes USA]

You should have  convertd to https in 2015.  You shop is vrrently being penalized.  Don't over think it now, switch to https.  Also there is not guarantee your site map is even read including robot.txt.