The best thing for you to do is ask your doctor. You can also do a search of the tablets on the net (not with the photo but with the actual name) and you’ll get your answer
You can google the tablet shape, color, and imprint/writing to find out what it is generally. That said, most drugs have many different generic tablet types, so multiple different ones can be the same thing—I’ve had metformin ER in both round tablets (with different letters) and oblong tablets, all with a powdery coating that is what makes them ER.
There are many different manufactures of generic metformin extended release tablets, each has it own shape, color and imprint. One thing I noticed is that all appear to be either oval or oblong in shape. Here are some examples, https://www.drugs.com/imprints.php?drugname=metformin+er
The name of your drug (Metformin Hydrochloride 500mg), as well as the manufacturer (Laurus Labs Limited) should appear on your pharmacy medication information sheet, as well as on the bottle itself. Probably in very small print.